DE2904380A1 - Duo tandem potentiometer control for radio or audio equipment - has two circular or linear resistive tracks with common slider between them - Google Patents

Abstract

The duo tandem potentiometer suitable for AM and FM radio equipment or audio equipment, has two parallel restive paths (P1, P2) with a common slider (S) which is moved between them. Points of high and low potential are connected to the opposite ends of the two paths. A parallel resistance (Rp) is connected across one path (P2), at the output. This is used where two outputs of different values are obtained. When used for a logarithmic high fidelity loudspeaker system, a resistance (R1) and capacity (Ci) are incorporated in series with one of the paths (P2), giving a tone control device. The design can be used for circular paths, with a rotary slider, or linear paths with a linear slider. The device can be operated by a suitable cord drive.

Description

Duo-tandem potentiometer as Soannuno divider with selectable curves

Potentiometers are generally used as a voltage divider in many Applications in radio and television technology, as well as in electronics. Depending on the application, special requirements are made with regard to the course of the curve.

It is known that for this purpose linear and logarithmic curves, or their combinations are used. The production of logarithmic resistance layers preferably takes place in a multi-layer process or in layered forms.

It is known that linear resistance layers or resistance slopes are easier to control from a manufacturing point of view than given resistance curves. This applies in particular to long-stroke potentiometers, e.g. for diode tuning Radio sets in which the pointer is directly connected to the grinder and can have lengths of over 300 mm. With these relatively long resistance tracks the electrically safe contact is already problematic. The resistance path must be here scanned and transferred to a contact track with the length of the pointer path will.

In radio devices with diode tuning, the aim is that at AN and FM areas a linear frequency division on the scale is achieved as far as possible will. For this purpose it is necessary between the Am areas and the FO area use different voltage dividers.

It is known that to solve this problem two switchable, jointly driven voltage dividers (potentiometers) are used, with a linear curve for the AM ranges and an approximate curve for the F range logarithmic curve is used. Another solution is in the patent application P 2630666 included, with a linear potentiometer through a shunt resistor an approximately logarithmic voltage divider between the wiper and the base potential for the FO area is achieved. The Nsb connection resistance is used for the AM areas switched off and the voltage divider acts linearly.

The invention relates to a double potentiometer P1 and P2 with a common grinder (S), which e.g. in long-stroke systems with a common, movable contact roller two parallel resistance lines in the same position connects with each other, whereby a Schleigerkontaktierung to the outside is omitted. Just the outer connections A1 - E1 and A2 - E2 the two resistance sections (beginning and End) are used for the electrical wiring. The resistance lines can be constructed in different forms, e.g. arranged in a circle Resistance tracks on carrier plates, resistance slopes in a rigid position, resistance strips on elastic plastic straps, resistance threads, with a vapor-deposited metal oxide layer, or resistance cord, with a thin resistance wire around the carrier thread. Auditions the resistance sections on elastic strings or threads are for long-stroke systems particularly suitable. These resistance paths can be very inexpensive in soc. Materware Unfinished to be taken up on rolls and offer for an automatic machine production great benefits.

The application according to the invention is used for the following description of two parallel potentiometers with a common electrically connected wiper without external contact with the designation "Duo-Tandem-Potentiometer".

Exemplary embodiments of the invention are shown in the drawings: Figure 1 Schematic representation of the duo-tandem potentiometer Figure 2 circuit of the duo-tandem potentiometer as a double voltage divider.

Figure 3 circuit of the duo-tandem potentiometer as switchable Voltage divider for AM-FM diode tuning Figure 4 Circuit of the duo-tandem potentiometer as a logarithmic, aurally accurate volume control.

Figure 5 and 6 arrangements of the resistance sections in rotating systems.

Figure 7 and 7.1 sectional view and arrangement of the resistance lines of two duo-tandem potentiometers, e.g. for stereo slide valves.

8 and 8.1 scanning and bridging of the two resistance lines through contact rollers, e.g. long-stroke systems.

FIG. 9 control roll with guide grooves; FIG. 10 contact roll with Guide grooves Figure 11 and 11.1 Suspension device for the contact rollers figure 1 shows in schematic form the circuit of the two resistance paths P1 and P2 with the connections A1 - E1 and A2 - E2, as well as the common wiper 5.

According to Figure 2, the Duc tandem potentiometer consists of two lenses Potentiometers P1 and P2 with a shared loop and the external connections A1 (beginning) and E1 (end) for P1, as well as A2 and E2 for P2.

The resistance section A1 - E1 consists of the voltage components the changeable partial resistances @ 101 and 111. The partial resistors R 10 '(A1-5) also has a variable parallel resistance R 12 '+ Pp (S-P2). result from it two consecutive voltage dividers T1 and T2, which are evaluated together can be. As a result, two partial voltages U1 'and U2' with different Curves are generated.

The dividers have the following changeable dimensions: R 10 '// P 12 '+ P @) divider T1' = (R 10 '// R 12' + PD) + R 11 'RD divider T2' = RP + R 12 ' This results in the following variable divider voltages: U 1 '= UB x T 1' and U 2 '= UB x T 1' x T 2 'Figure 3 shows a circuit of the duo-tandem potentiometer for an A @ -FM diode tuning. The electrical function is essentially the same the description of Figure 2. To obtain an ionarithmic curve for the The voltage divider becomes the FM range and a linear curve for the AM ranges switched.

In contrast to the circuit according to FIG. 2, P 1 has an adjustable one Foot resistance R 20 for the FM range and a foot resistance for the AM ranges from the parallel connection of P 20 // R 21 to generate the required, different initial voltages.

In switch position AM the shunt resistor RP is switched off, so that there is a linear voltage divider, which is only achieved by the linear resistance line P1 is determined. The circuit can also be modified in such a way that the multicircuit resistance Rp remains in function and the up to approx. 75% of the lifting or turning path Approximately linear stress components represent the directional stress for the Am areas is taken at the outlet point A 2 (P2). The AM-FM area switching can also be switched contactless with semiconductors.

Fiqur 4 shows a circuit example of the duo-tandem potentiometer as a logarithmic, aurally accurate volume control. The logarithmic voltage division is explained according to the circuit in FIG. For aurally accurate linear distortion of audio frequencies, Depending on the volume setting, there is an R / C - between A 2 (P2) and the base Link, consisting of Rl and C2 connected. This R / C element acts through the resistance path S - A2 as volume-dependent tone control. A portion of those that were cut as a result high frequencies are brought into an aurally correct equilibrium via C1 to A2 (P2). The resistor Rp can also be part of the following amplification stage.

FIG. 5 shows schematically the arrangement of the two linear resistance paths P1 and P2 in adjacent circular form, with the associated external connections Al - El (for P1) and A2 - E2 (for P2). The slider S bridges in variable Position the two resistance sections P1 and P2. Making the two circular Resistance paths P1 and P2 are expediently carried out with a similar resistance mixture. If it is required that the resistance paths P1 and P2 have the same resistance values, The width of the resistance lines must be in proportion to the diameter be brought to the circular shape.

FIG. 6 schematically shows a three-way system of the duo-tandem potentiometer with two semicircular resistance sections of the same type P1 and P2 with the associated External connections Al - El and A2 - E2. The slider S bridges in changeable Position the resistance sections P1 and P2.

FIG. 7 shows a sectional view of two mutually arranged Duo-tandem potentiometers with the resistance sections P1 / P2 and Pl.1 / P2.1 and the jointly operated sliders 51 and 52. The resistance paths PiP2 and

P1.1 / P2.1 are taken up by carrier plates 1 and 2, respectively. Appropriate The same linear resistance values and embodiments are used for P1 and P2.

Figure 7.1 shows a view of the resistance sections arranged in parallel P1 and P2 with the connection points nl - El and A2 - E2, which are from a carrier plate 1, as well as the grinder S, which in changeable position the Resistance sections @ 1 and @ 2 bridged.

Figure 8 and 8.1 show a schematic embodiment of the duo-tandem potentiometer as a long excursion system e.g. for diode tuning in radio receivers, whereby the Pointer is moved together with the contact roller S.

The resistance sections P1 and P2 consist e.g. of two flexible ones Resistance threads, resistance bands, or resistance cords with the connections A1 / E1 and A2 / E2. The two resistance paths P1 (A1 - E1) and P2 (A2 - E2) become bridged with a contact roller S in a variable position. The resistance lines P1 and P2 are mechanically tensioned in the longitudinal direction by the springs 4 and 4.1. The counter rollers 3 and 3.1 made of insulating material thereby cause a Pressure of the contact roller 5 and the resistance paths Pl and P2.

Figure 9 shows the contact roller S with the guide recesses 5 and 5.1, as well as the resistance stretches P1 and P2 designed as resistance threads.

Figure 10 shows the contact roller S with the guide grooves 6 and 6.1, as well as the resistance sections P1 and P2 designed as resistance bands.

Figure 11 and 11.1 show an embodiment of a suspension device 10 with the storage centers 7 and 8 for the pressure rollers 3 and 3.1, as well as the storage center 9 for the contact roll S. The rolls 3, 3.1 and S are only used in the hanging device 10 inserted and from the longitudinally prestressed resistance sections P1 and P2 anchored in its storage position 7, 8 and 9.

Considered publications: DE - PS 1269689 DE - PS 1277954 DE - AS 2001660 DE - OS 2109219 nE - ns 2207766 DE - OS 2630666

Claims (8)

Claims 1. Duc tandem potentiometer, as a voltage divider, that anreusbart by the fact that according to Figure 1 parallel didarsta @ @abnan (P1 @@@ P2) with a common grinder (9) in variable 9 with @ @@ trienn with each other be connected, with only the beginning and ground points (@ 1 - Z1 and A2 - E2) of the two Resistances @@ ken (P1 and P2) as connections for a voltage divider with wäch @@@@@ @ - @ @@@@@ @@@ @@@@@@ @@@@@. 2.) Duc tandem potentiometer, as a voltage divider according to claims 1, characterized in that according to the circuit example Figure 2 means @@@@@ Patenschlußwidersstandes (A0) two inaccessible parts @@@@@ anne @ n (U1 'uns U2') taken at the same time will. 3.) Duc-tandem potentiometer, as a voltage part, according to claims 1 at 2, characterized in that according to the circuit example Figure 3 for a Di @ d @ ngo tuning in bundle radios, two switchable, below-a-bare partial grannings (UR / AM and UR / FM). 4.) Duc tandem potentiometer, as a voltage divider according to claims 1 to 2 characterized in that according to Scheltungsh @@ there are figures @ @ @ arithmic, correct air strength ratio is achieved. 5.) Duc tandem potentiometer, as a voltage divider according to an or several claims 1 to 4, characterized in that according to Figure b the resistance paths (P1 and P2) are arranged in a circle next to each other and a grinder (S) the two resistance sections (P1 and P2) in a variable position with each other electrically connects. 6.) Duc tandem potentiometer, as a voltage divider according to an or several claims 1 to 4, characterized in that according to Figure 6, the two, Resistance sections (P1 and P2) are made in a semicircle and a grinder (S) the two resistance lines (P1 and P2) in a variable position with one another electrically connects. 7.) Duo-tandem potentiometer, as a voltage divider according to an or several claims 1 to 4, characterized in that according to Figures 7 and 7.1 a slide control from a DTD unit, with a common slide operation is, the wiper (S1 and S2) each having the resistor sections arranged next to one another (P1 / P2 and P1.1 / P2.1) electrically connects in a variable position. 8.) Dus-tandem potentiometer, as a voltage divider according to an or several claims 1 to 4, characterized in that according to Figures 8 and 8.1 the mechanically prestressed resistance sections (@ 1 and @ 2) in the longitudinal direction made of flexible resistance threads, resistance bands or resistance cords and the slider consists of an electrically conductive contact roller (5), with two isolated, equal counter rollers (3 and 4) the guide and the contact pressure between the two resistance lines (P1 and P2) and the contact roller (5).