DE1965223A1 - Push-button circuit for a programmed frequency selection in radio and television sets - Google Patents

Description

Stutt ~ art - '.' On fenhausen

- "irth - strake 42

VB is known to use contacts to switch to tuning or streams. H. ^ ufi ^ such contacts are provided in a Ύίί tennatz, in v / nlchem of each for switching ben ^; > Start the contact by pressing the relevant key

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• '.Schr "' d-3r - K, Hauer 35-2

Push-button circuit for a programmed number of friends j η radio and television equipment,

"'ι.- ¹ -'rf indun? refers to a key circuit for a programmed frequency, in which the tuning voltages or currents, in particular for setting broadcast radio and television sets, can be switched to preselected frequencies by means of a variable resistor.

Purpose of such arrangement is to be able to make a quick choice among programmed tuning without Oerät i edesmal having to retune "

"oll these ^{iJmschaltvorfic:} nqen a Sereichswahl FILR frequencies of different frequency ranges get ^ ti ^ tv / earth, λ h are the f ⁱ r the iiereicln ^ ^ e UmschaltvorRSn ahl necessary pre-

■ W.Schröder 35-2 - 2 - 1 9 6 5? ? 3

will. This actuation state is stored mechanically. The will only be triggered when another key is pressed previously saved state »The last contact made remains stored and releases the mechanical lock beforehand the previously pressed key. But there are also rotatable units known in which the Köntaktgabe by pressing a rotary knob happens in the manner of the known multiple changeover switches.

The storage of the tuning voltage or the tuning current is generally achieved by having a variable resistance is set to the desired tuning value ". Should be at the same time If the frequency range is also stored and switched over when the relevant key is pressed, a further memory arrangement is created used. For example, if there are three areas, then there is a three-digit range switch for each of the frequency selection buttons of any number, the mechanism often exists from a nose that can be brought into three possible positions, If a frequency selection button is pressed Red, it is pressed at the same time the correct position according to the position selected with the nose Range switching contacts. Other solutions are known in the case of the ei a separate range switch is assigned to each frequency selection button which corresponds to a normal electrical switch, and the only becomes electrically effective via the contacts of a frequency selection button. '

All of these well-known key units have the advantage that they can be used in In each case a considerable operating pressure is required. diesel Power can be reduced by using electronic changeover switches.

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• BAD QBlGiNAk

avoid.

It is already known as a gas-filled electronic changeover switch Use relay tube. The gas-filled relay tube, however, requires a relatively high ignition voltage and its use in battery-operated Devices or other devices that work with low voltage always require additional effort to set the ignition voltage to create. In addition, it is not possible, with the aid of this known circuit, to select a range at the same time as the frequency selection "' perform.

All previously known circuits of this type cannot be used either remote control by simple parallel connection of pushbutton contacts.

The invention is based on the object of avoiding the previous specialist parts of known voting units, reducing the contact pressure to a minimum or to zero and designing the circuit in such a way that it operates with low voltage ¹ . A remote control by parallel switching a simple push button contact should be possible.

According to the invention, this object is achieved through the combination of the following individually known circuit arrangements solved *

a) The variable resistor determining the preselected tuning voltage or the preselected tuning current forms together with ^; an electronic switch, in particular a bistable multivibrator, a switchable semiconductor or a relay, the switchable branch of a voltage or current divider.

/ 0816

-.>;. i ^; !; i * ': fiSi

b) All switchable branches either have a common one Series resistor at which the switchable Ahstimmsoannunp occurs or a 'common load circle through which the

■ switchable tuning current flows, or the wiper of the variable resistors are set depending on a diode to a common point on ^{the first}

c) The current triggered in a switchable two σ controls al] .e other switchable parallel two-pipe without current.

In the course of the invention, the circuit is designed in such a way that. ^D of the current of all "electronic switch flows through a" one to amen- 'Jiderstand whose voltage output is used to turn off the electronic switches do not need.

According to a further embodiment of the invention is as electronic Switch a switchable leakage conductor or think well-known equivalent circuit provided with complementary transistors.

In some cases it can be useful to save the last Rc-t "ti <? Th key press or its tuning circuit even after the device has been switched off. In general, bistable electronic switches are not able to save this state without operating voltage ; therefore, after a different development of the _;

With the help of the invention, the following advantages in particular

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^ m, G ₀ , BAO oriqinAl

Vi. Schröder 35-2 - 5 - ' A Q £ c O J O

aims:

1, The pressure to be exerted to press the key is minimal or with contact unfiskontakten üraktiseh Mull, This also applies to the Use of proximity switches, · ·

2, The type of "circuit results in a minimum of connecting lines, even if area switchovers have to be carried out at the same time,

. .-. ■ .. ■■. i

3, The advantages mentioned, allow accommodating a very small operating part at any distance from the actual circuit * This results in the Rehpuse constructions very simple variation options,

'f Since the circuit - allowed to arbitrarily each key ^p apply many aralleltasten, a remote control is very simple. Any number of remote controls can be operated in parallel with the main body or even without the main control

be, ί) ί ο. Number of connections or wireless operation "™ the required ripnale is very large

^c j, ^r J'i-s I inf ""; en of Signal la rap en or other Ri, qnalanzeipen is without additional effort in the ploktronic switch units i "'jrlich, Oiese ^ ipnalariz ^ ip.cn also remain with Remote control v / i rk'jdn. '

O, The ^r ; chn, ltum ^: is in high measure for an integrated technique

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W.Schröder 35 - 2 suitable.

Exemplary embodiments of the invention are shown in the drawing and are described in more detail below, It lines

FIG. 1 shows an exemplary embodiment in the form of a block diagram

Figure 2 shows another embodiment, also in form
a block diagram

FIG. 3 shows a detailed circuit of a further embodiment = example.

In Figure 1, the RF part is denoted by 1, which by means of the antenna 2 for reception at transmitters of different frequencies and in
is suitable for different areas,

Finally, the signal can be taken from output 3 of the HF section
are selected with the help of the tuning unit, which works here for example W nvit varactor diodes D- ^, D_, Dg, and the following stages of the receiver are supplied. The HF part 1 has further connections 5, 6 and 7, each of which has to be supplied with a certain switching voltage to select a certain frequency range, e.g. the television ranges Band I, Band TII and Band IV / V {TF units are well known and are therefore no longer described here.

A connection M serves to supply a selected tuning signal

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ORIGlNAL BATHROOM

and is therefore connected to a voltage divider, which consists of a resistor R ₂ on the one hand and the adjustable resistances R, ₂ , R, R ₃₂ up to R - and the respective series circuit of an electronic switch S ^, S ₂ , S ₃ to S _n, on the other hand, is formed, this series circuit having a straight resistor R ₀ . at the reference potential e.g. ', at ground. With U . the supply of a stabilized voltage is called. The _{resistor R 3} generates the voltage drop that is used to block the electronic switch that is not currently required * For this purpose, each control input of the electronic switch S,

■ '"· ■■ i

S ₉ , S to S _n , here denoted by G ,, G, G- and G, "over each ™ a resistor R-, _ti » R _n ., Rqi, to R, selected to be high resistance

XH 24 "^" n ¹ + ■

can be connected with the reference potential z, B «with Hasse. At the same time, each control connection of the electronic switch is provided with a button TS ₁ , TS; 1 '.. TS ₃ to TS connected, which makes it possible to apply a control potential to the respective control electrode of the electronic switch in question, which controls the switch in the conductive state, and puts the electronic switch in the conductive, self-sustaining state and thereby at the same time the previously energized switch via the mechanism already mentioned ύ due to the voltage drop at Pv ₃

. In this way, the connection 4 receives the adjustable Resistors R., R, R "" preselected voice voltage.

Another embodiment example that besides the vote on a preselected frequency, at the same time when you press a

using the TS ₁ , TS ₀ , TS ... TR ^{buttons to switch to the preselected 1 l} g n- ■.

Frequency range causes zeip.t.-dfp Fipur 2. The show up for it

1098.27 / 08.16

For this purpose, switching voltage or switching current inputs 5, 6 and 7 are _{each connected directly or indirectly via the electronic switches S n} j S ', S ₃ Q to a different contact of a three-digit changeover switch US, US ... US _. In the BeisDie] shown, the switch US is in the position that sends a Sehaltsi.qna 'via S ₁₀ to the input 7 as soon as the TS ₁ (Fi ^ ur 1) key is pressed. For this purpose, the switching arm of the switch US] _q _{= is placed} at point G of the electronic switch S-.

In this circuit it is assumed that a control signal appears at the control input G when current flows through the switch S. Of course, this control signal could also be applied to another electrode of the electronic switch S-. can be removed. What are the advantages of taking this signal at point G. | would already be explained in more detail. Since the at the control inputs G-, G _ «». 6- occurring switching voltages are of a bistable nature, the possibly provided electronic switches S-, q, $ 20 · »· Sjq only need to work in a monostable manner. The changeover switch US ₂₀ is set in the position shown in such a way that it brings the control signal from point Q ″ of the electronic switch S ₂ to the input 5 of the HF section via the switch US and S _30. Finally, de ** ^ US switch is shown in the middle position, whereby it is allowed to act the control signal from G ₃ through S ₂₀ to the input 6,

If you assign the inputs S ₁ . & and 7 each add the band I / dft · band tiI and band IV / V, the following reception possibilities result when the key TS., - shown in FIG. 1 is actuated. And the position of the switch ÜS, ₀ shown in FIG. 2 would be a transmitter in the range

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^il '^i; * ^ r BATH ORIGINAL

TV / V can be received. At. Pressing the button TS ₂ (Figure 1) and the position of the switch US ~ _n shown in Figure 2, a transmitter in band I would be received and finally when pressing the button TS _n (Figure 1) and the position of the shown in Figure 2 * Switch US ^ would be a station in television area III to be received.

It goes without saying that the illustrated circuit example of the figures is 1 and 2 are not restricted to recipients. It can be done in the same way also for end frequencies can be switched, J

A detailed and practically executed circuit example is shown in Figure 3. By closing the TS- button, _{a complementary transistorDaar T-, Ti is controlled by U 8} ^, and it can be connected to the? Voltage divider R ₂ ZR-T-, + R by changing the resistor K | 2 the tuning voltage for the capacitance diodes of an HF part can be set, release or (opening the button brings the current throughfiang and thus the set tuning -oellrrt active, ■ ' M

If you press the TS ₂ key, the transistors T ^ T _{2 should be} conductive, d'i ': e ~ ^r en T, T ^{1 are} de-energized; this is done by the increase in ^c "nanriunp the common resistor R ^, vrobei" facilitated time, the "Dannuni" on T ^ using the KondenBators C ^ fentgehalten v / ground mn ". Here, the measure will be implemented to provide for the Afbeitnwiderotand a Zeitkonatante the potential at the reference electrode for the duration of Schaltvörganges Diö erforderlichon on ^dom;.. / this holds ert C. _r) at a bestimniton Ki-n ^ tel-lunr "

109827/08 16 "* ^K> " *

of the controller R, "is not short-circuited, is due to the Restr-Tider · stood R-V-, a certain minimum time constant was taken care of.

In order to obtain a large voltage drop when pressing another key, for example the TS ₂ key at Rg, and to safely block the switch unit that is still carrying current, e.g. T, T ^f , an additional current is passed via the resistor R ₂₀ and the transistor T ^ . This measure achieves a minimal current in the separation divider,

The resistors R, ^ and R "are bleeder resistors at the control inputs and R. and R series resistors, the capacitor C _2n corresponds in its function to the capacitor C- ^ qj resistor R- ^ q the resistor R20 and the resistors R ₂ -J and R ₂₂ the resistors RQ and E] _2> so dap; their functions do not need to be specifically explained again.

In this embodiment, two complementary transistors were used as electronic switching units. As already mentioned, these transistors can also be replaced by a suitable semiconductor; with discrete components, qezeiryt, iline corresponding third Schatt unit to the block represent ,; 300 There but can be switched even as many scarves to inn el th ¹ I-HO, 500 ,,, Noo Tvirnlle. On ArischIuP-nunkt ¹ V the tuning voltage taken; '

The preselected voltages or currents to be switched bring the '

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"* Γ BAD ORIGINAL

W.Schröder 35-2 - 11 - 1968 223

Voting arrangement is> i electronically by means of controllable Reactance levels, such as capacitance diodes or those that can be influenced electromagnetically Inductances, at the desired frequency, the tuning voltages or - Currents can also be switched in bridge circuits, with the help of which the tuning arrangement can then only be switched Turn it adjusted by the electric motor. For each of the selected frequencies a switch is required *

The control electrode at the control input of the electronic switch can also be decoupled by a capacitor or a choke instead of a current-limiting resistor,

^If a capacitor is used to initiate the switchover process, the charge of which is passed to a control electrode, in particular in the case of all-current devices to meet the safety requirements against electrical shocks for charging / discharging the capacitor, it is advisable to use such high-temperature resistances be used that the permissible contact current! is not exceeded. "" ■. "."

VJenn with the Ua-hl of tuning a range change is to be connected, they must Diö ■ recently -n ^ ernseheinDf '^

the Berel © hsufflfe @ hi; itkontakt & inserted switching diorels, can or can be made by a -Haltsfeom l ^ IteHd ElectiOmeohanic KeIaIs for the Berelchsymscha.lt at the same time operated with the control of the switching unit »

You can then do a circuit in front of you at d * »T» der

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Current of the switched-on switching unit directly to the area door switch controls, each switching unit being assigned a mechanically operated electrical switch with as many switching points how areas should be switched.

When the current of a switched-on switching unit is used as a holding current because of the differently set working resistances is unsuitable for range switching »a switching off ' Leadership can be selected in which the variable working resistance is achieved using switchable semiconductors or their equivalent switching points is on an electrode, "through which" a much lower current flows than through a neighboring electrode, whose f. tr on is limited by a fixed series resistor, this current is used as a switching or holding stick for other switching branches »

In other cases it may be useful to turn the range switch. directly via another amplifier or electronic switch to control, using the amplifier or electronic switch, who operates the range switch, from one in the R circuit unit stored voltage - or current change? on its control electrode being affected.

If a very precisely working control circuit is to be used, the control electrode of the electronic switch or Amplifier directly or indirectly connected to a control electrode = of the switchable semiconductor or its Frsatzschaltunq be. The advantage of this circuit is that it works on this Control electrode, if dia-main electrode η carry current, .e.iiw '\ ini.

• - 13 -

109827/0816

the starting voltage, the increased voltage of the reference electrode and, in the blocked state, the blocking reference potential occurs, then also for the safe blocking of the electronic switch or amplifier is used.

In some cases it is useful to recall the last key press to be saved even after switching off a device. In general bistable electronic switches are not able to do this To save the state without operating voltage, therefore another Exemplary embodiment of the invention proposed according to the Versorunqss-nannun ^ for the electronic switching units even when switched off of the radio or television set is maintained.

The storage elements can be rechargeable batteries that parallel to the supply voltage or electrolyte capacitors to be used.

In order for the Sneichervorqang during the "break in operation of a device To s.oaren power, it may be useful to only save to the potential at the control electrode of the electronic switches nhei th to Ixi'j ehr tines, with electrolyte capacitors on these electrodes or other storage elements of variable voltage started up.

"• ^enr;? 'Electrostatic Jig electronic switching units, jgzwt effective capacitive Steiiereinf ^ npe own, so the circuit can such aur /' be eff'hrt as ⁰ for storing the switching state during dor uetriebspause one.

-. ■■■ -. 14 -

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OBIGINA «-

W.Schröder 35-2 - IM- -

There are no leakage resistors on the S-control electrodes, so that the electrostatic charge present on the control electrode is saved.

The control electrodes can also be used during operation Device can be supplied with voltage by electrets.

If it is not necessary to save the keyed state while the devices are not in operation, the automatic selection a preferred frequency when switching on the device is desirable be. For this purpose, the arrangement is to be made in such a way that the power button of the device is mechanically linked to a specific frequency selection button.

If a mechanical coupling is not possible, it will be switched on of the device from the voltage of the power supply unit, the inrush current of an existing in the circuit or an additional one ι capacitor to the control electrode of the preferred to be operated Switching unit guided.

Since with use of electronic switching units of the switching state of the display is not readily visible, an Ad ^ e is provided in the switching state in that a display device is used in a directly or indirectly triggered SchaltstromzweiR; ⁼

The display can be by means of a Sipnallamne, a luminous diode or an electromechanical device,

- - 15 -

t 109827/0816

Ί. Schröder · 3 5-2 '-15-

If remote control of the electronic switching units is desired «, so each switching unit becomes parallel to the main control unit by wireless or wired, for example by keying triggered signals actuated *

Another remote control option is given by the fact that the mechanically operated control unit of the buttons or the * Touch contacts triggered the switching gears by touching them x -. 'or other known proximity switching devices each are only provided simply and. that these bewitched are connected to the device by cable or wirelessly *

All circuits mentioned so far as examples can be very advantageous accommodate in integrated circuits ,, Z -. B »in. monolithic Technology * This can be done individually for each switching unit or combined in groups or all in one Chip. Since in these cases neither the buttons nor the changeable Let resistors integrate, it is useful ,,, the changeable Resistances to a common connection point

bring in order to save external contacts of the monolithic component. The same measure is also used for the contacts of the buttons expedient.

25 claims >

3 sheets of drawings with 3 figures

10 9 8 2 7/08 T $

Claims (5)

Godfather tans-preg hey 1. / Tactile switch for a programmed freeze selection, in the case of abs timin voltages or currents in particular s \ ar Firs tellur: · From radio and television ^. ~ e; w - ". kept frequencies by means of a changeable hi tiary level switchable sin ·." ¹ , characterized by the combination of the following circuit arrangements known per se a) The preselected voting soannun '· or the preselected one; Voting current determining variable resistance forms along with an electronic switch, in particular. a bistable multivibrator, a switchable one. Ln 1b « conductor or a relay, the switchable two <r one Voltage or "current divider. b) possess all switchable Zweiee either a -eneinr, - men series resistor to which the u ^T ischaltbare Abnti ^^ p-napnun "occurs or r a peneinsamen Belastungskrei, d ^ ircli to the switchable tuning f J ie: - -t, or the wipers of the changeable resistors are each connected to a common point via a diode. -. C) The triggered in a .umschaltbaren two Ptrom r.feuert all other umschaltharen Parallelz ^T 'Eipe energized, 2. Circuit according to claim 1, characterized ^ ckennzei without t, da ^ .der - 17. - 1 0 9 8 2 7 / Q 8 t 8 BATH ORIGINAL Schröder 3 5-2 -17- n of all electronic switches via a common ' '-'ider stand flies, its voltage drop to switch off, the electronic container that is not required is used - » 3, circuit according to claim, 1 or 2. «,. through this . This designates " there? - at the control input of the electronic switch: the control electrode through a" current-limiting "resistor. Capacitor or a choke is deconuated, _% Scnaltun ^ according to one of the preceding comments by being . * denotes _t because ⁰ 'a capacitor is provided _t whose charge of the switching process on a control electrode S, Hchaltttn ^ after Anspnach% _κ dadorch .-- ^ ekeHHzeiohneit · _f '■: ■ that -zwe / uf * and / or rintlaftarip of the condenser-s so hour yerweniduinrf find _t . UbP- the
not "exceeded wecl *., 6 « ^ .GfosXtixnr ?: n ^ Gh a dev vosrheri * ehendeB ^ as ElektroKiseiier switch ·, edm or fiess ^ a anrsieA b ^ kaöftte Ers-atzschäitöBR with ft ^ OFf? «See rs. iöt * "..". "" --.- ■ 7 » P, eh &% tnviP nach % & itk & m $ -tatet & erfeält ^ die · eias P ^ temtial am iisif •• / .. Schr'Vder 35-2. . . - IR - ° - »circuit according to claim 7, because .nekenng. ei honored t, d η ^. the '-io.it constant such pew- "hit ίεΐ, that ρ? a capacitor indirectly oricr directly parallel to the working resistance or to the pin part
"■ the same is switched» 9 .. circuit according to one of the preceding address .insbesondre
for devices, in which part of the range switching contacts
Scha ltdi öden, are provided, by a switching current. Master / n = be peipacht or electromechanical relays f r ^ the ^ - reichsiaiftschaltiing Fleichzeit.iH with the control of ichalteinheit actuated "are characterized bekennzeichnet _t that the Strop the switched Schalteinfteit directly to Sereichsunschajtßr
controls each switching unit a mechanical to ^
ELECTRIC ITET HOLDER with so many switch positions
_s how areas should be switched tight i- 10 * Schaltaris. near one; of claims 6 - 9 dadarc | i _; marked _t » d: a & for Ψβτχ-ΐ & η & ηΜ ^ νοη sehaltable semiconductors or their replacement sehalttin ^ ens the changeable-working resistance at a-Kiek tvoe, _t itber» · which flows a significantly lower ¹ current than. f ^T b-ei? · 'a flaehiljaFelefctrOdeg dterew current dttrch a fixed "series resistor, is limited ^ whereby this current is used as a switching - © the Haiti" - * for other branches 11 »gefraltwEii * itäeft einsra des * · Ansnr ^ che 1 -» desolate? elektronisebs IIin ^ eBtaltet * ^ efsr ά & η Bö. betefti ^ -t by eirrex * lh net? Seshattsimheit ge i ■:. ■■: - ■■ ^;; _; - BADORiGlNAl. ./.Schröder 35-2 - 19 - - cherten voltage; - or change in current at its control electrode being affected. . ■ - ■ "." .... '.. 12. Circuit according to one of claims 1 - 10, thereby Rekennzeic.hr. jTet. 4. that the control electrode of the electronic holder or Amplifier directly or indirectly with a control electrode * of the switchable semiconductor or its equivalent circuit is connected » · ■: ■ '■■' · I 13..Schaltung according to one of the preceding claims, characterized in that the supply voltage for the electronic SchaIteinheiteη see even after switching off the radio or television more cites is maintained. 14. Circuit according to claim 13, characterized. » that as storage elements rechargeable batteries, which are parallel to the V he sorgurws voltage or electrolyte capacitors are provided. "■■." .- ■ 15. A circuit according to claim 13, characterized in that abut the control electrodes of the electronic switching units electro lythkondensatoren or other storage elements. . Circuit according to Claim 13, characterized in that for ""'".'""Storage of the switching state at least during operation of the device on the control electrodes of the electronic Switching units are no leakage resistors, such that the stores electrostatic charge ee present on the control electrode will. 17. A circuit according to claim 16, characterized in that "the control electrodes are supplied with voltage during the break in operation of a Her-ites of electrets" 18. Circuit according to one of the A ns OrU before 1 - 12, thereby qekonnza i cnnet that the switch-on button of the device is mechanically coupled with a certain frequency selection button « 19. A circuit according to any one of claims 1-12, characterized in that the neta gekennzgich EinschaltStromstoR a present in the circuit or an additional capacitor to die.Steuerelektrode "which is preferably guided to be actuated switching unit when the unit of the voltage of the Metz part forth 2C. Circuit according to one of the preceding claims » dadureh characterized ^ that a display device einqesciia.ltot '^ H, 21, circuit according to claim 20, characterized in that " the display device consists of a signal noise, a Lumi'nizensdiod-p or an electromechanical device, 22 «Circuit according to one of the preceding Λ ns t> r v'lc he \ d adur c h ge - 10 9 827/0816 ^ ""'^??; ^ ^Λ -. 8ADOR (GiNAL '•.'. Schröder 35-2 - 21 - denotes "aal each switching unit in parallel to the bet Hauntbedienunqseinheit by wireless or drahtqebundene example triggered by keying signals tigbar ^ is (remote control), · -. . ■ _ "■ - ■ 23, FchaltunT according to one of claims "1 - 21, characterized in that the mechanically operated operating unit of the buttons or the touch contacts are triggered by their contact with the switching devices or others known devices that are switched down by annually are only simply available and that these units are connected to the device via cables or wirelessly, 24. ^ circuit "according to one of the preceding claims, characterized in that the rehabilitation units are designed as integrated circuits, in particular in monolithic technology. 5. University of claim 24 | characterized in that the changeable supports and / or the Kpntakte of the keys are fed to a common connection point.