JPS6211434B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radio cassette device, and more particularly to a radio cassette device that allows switching from tape play mode to radio broadcast reception with a single operation.

A radio cassette device is a handy type radio receiver with a cassette device built into it. In this case, conventional cassette devices that are commonly used are equipped with a mode switch that selects between the radio and the cassette, and after operating this mode switch, the operation in the selected mode is performed in a two-step operation. ing. In other words, if you want to play a cassette tape while receiving a radio broadcast, first operate the mode switch to switch from radio mode to tape mode, then press the play switch located on the cassette tape section. must be operated. Also, if you try to switch to FM broadcast reception from this state, after operating the stop switch, set the mode switch to radio mode,
Next, you have to operate the FM switch located on the radio part. In this way, conventional radio cassette devices simply incorporate a cassette device into a radio receiver, and the control systems for both are independent, making their operation complicated. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a radio cassette device which can be switched from a tape play mode to a radio broadcast reception mode by simply operating a single button. Hereinafter, it will be explained in detail using the drawings.

FIGS. 1 and 2 are circuit diagrams showing an embodiment of a function control section and a cassette control section used in a radio cassette device according to the present invention, in which the function control section includes a non-lock type off button S ₁ , an AUX Button S ₂ , AM button S ₃ ,
FM button S ₄ , play button S ₅ , record button S ₆ ,
It is configured to control a radio receiver or a cassette device in response to operations of a fast forward button _S7 , a rewind button _S8 , and a stop button _S9 . One end of these switches S ₁ to _{S 4} is connected to ground or a backup power supply (a power supply that continues to supply power from the built-in battery even when the power switch is turned off) via the lock switch S ₁₀ .
Switched to BV _cc . In addition, switch S ₅ has one end connected to the common terminal of lock switch S ₁₀ or the backup power supply via cassette switch S ₁₁ .
Switched to BV _cc . On the other hand, Switch S ₁ ~
The other end of _S5 is connected to input ends A to E of the radio control circuit LC via resistors _R1 to _R5 , respectively. In addition, each switch S ₁ ~ S ₅ and resistor R ₁ ~
A backup power supply _BVcc is applied to each connection point of _R5 via pull-up resistors _R6 to _R10 .
Therefore, when any of the switches S ₁ to _{S 5} is operated and the input terminals A to E of the radio control circuit LC become "L", the radio control circuit LC outputs signals to the input terminals A to E that have become "L". The corresponding output terminals a to e are configured by IC circuits so as to continue sending out "L" outputs. LD ₁ to _{LD 5} are power supply V _cc and radio control circuit LC
Protective resistors R ₁₁ to _{R 15} are installed between output terminals a to e, respectively.
and light emitting diodes for control status display connected via diodes _D1 to _D5 , _OT1 to _OT4 are control signal output terminals connected to each cathode side of diodes _D1 to _D4 , and _OT5 is The control signal output terminals R ₁₆ to _{R 20} connected to the cathode of the diode D ₅ via the diode D ₆ are pull-up resistors. On the other hand, one end of switches _S5 to _S9 is a cassette switch.
Connected to the common terminal of S ₁₁ . The other end of switch _S6 is a tab detection switch that detects the presence or absence of a tab on the cassette and prohibits re-recording.
Flip-flop FF ₁ through S ₁₂ and resistor R ₂₁
is connected to the set terminal of Switches S ₇ and S ₈ are connected to set terminals of flip-flops FF ₂ and FF ₃ via resistors R ₂₂ and R ₂₃ , respectively. On the other hand, the reset terminal of flip-flop FF ₁ is connected to resistor R ₂₄ and diode D ₇
~ _D11 to the output terminal e of the radio control circuit LC, each set input terminal of the flip-flops _FF2 and _FF3 ,
It is connected to the output end of switch _S1 and the output end of switch _S9 , respectively. flipflop FF ₂
The reset terminal of is connected to resistor R ₂₅ and diode D ₁₂
~ _D15 is connected to the output terminals of switches _S5 , _S8 , _S1 , _S9 . The reset terminal of flip-flop FF ₃ is connected to resistor R ₂₆ and diode D ₁₆ ~
It is connected to the output terminals of switches S ₅ , S ₇ , S ₁ and S ₉ via D ₁₉ . Note that the diode _D20 is a diode that supplies the output of the switch _S9 to the input terminal A of the radio control circuit LC, and _R27 to _R30 are pull-up resistors. On the other hand, each output terminal Q of flip-flops FF ₁ to FF ₃ is connected to output terminals OT ₇ , OT ₉ , and OT ₁₀ . Q ₁ to _{Q 3} are transistors that input each output Q of FF ₂ to flip-flop FF ₁ and send out inverted outputs, OT ₈ is an output terminal that sends out the output of transistor Q ₁ , and LD ₆ to _{LD 8} are resistors R. ₃₁ ~ R ₃₃ is a light emitting diode connected between the power supply V _cc and each collector of each transistor Q ₁ ~ _{Q 3} , D ₂₁ is a diode connected between switch S ₉ and output terminal OT ₁₁ , Q ₄ is a transistor connected between the power supply V _cc and the output terminal OT ₆ , and the transistor Q ₄ is connected to the output terminals b, c of the radio control circuit LC via a resistor R ₃₄ and diodes D ₂₂ to _{D 28} . , d, e output,
The outputs of transistors Q ₂ , Q ₃ , and Q ₁ are used as base inputs. D ₂₉ is a diode connected between the output terminal OT ₅ and the emitter of transistor Q ₁ , D ₃₀ and D ₃₁ are diodes connected between the reset input of flip-flop FF ₁ and transistors Q ₂ and Q ₃ , and G ₁ is a diode. Switches supplied via D ₃₂ to _{D 35}
This is an AND gate that finds a match between the outputs of _S6 to _S9 and the reset input condition of flip-flop _FF1 , and the output of this AND gate _G1 is connected to the inverter _IN1.
and radio control circuit LC via diode D ₅₄
is supplied to input terminal A of. G ₂ is a diode
This is an AND gate that seeks a match between the outputs of the switches _S1 to _S4 supplied via _D36 to _D39 and the output of the output terminal e of the radio control circuit LC, and the output of this AND gate _G2 is connected to the inverter IN. Output end OT ₁₁ through ₂
is supplied to.

S ₁₂ is a cue switch, S ₁₄ is a one-side repeat switch, S ₁₅ and S ₁₆ are interlocked one-track repeat switches, S ₁₇ is an end switch that detects the end of the tape, and INT ₁ is an input terminal for the inter-track detection signal. , _Q5 is a transistor whose base input is the inter-track signal supplied to the input terminal _INT1 via the resistor _R35 , and the power supply _Vcc is supplied to the emitter via the diode _D40 and the resistor _R66 . ing. _G3 is an AND gate for matching the output of the switch _S12 , the output of the transistor _Q5 , and the outputs of the transistors _Q2 and _Q3 with the signal supplied via the NOR gate _G4 ; ₃ output is inverter
IN ₃ , radio control circuit LC via diode D ₄₁
and the reset input terminals of flip-flops FF ₂ and FF ₃ , respectively. _D42
is a diode which supplies the output of transistor Q ₅ or _the output of switch S ₁₇ to the reset input of flip-flop circuits FF ₁ and FF ₂ and the set input of flip-flop circuit FF ₃ depending on the selection of switches S 15 and _{S 16} ; Memo switch _G5 is an AND gate that determines the coincidence between the output of flip-flop _FF3 and the output of memo switch _S19 , and uses that output to control various parts via diode _D43 in the same way as the output of switch _S9 . The above is the configuration of the function control section shown in FIG. Next, the configuration of the cassette control section shown in FIG. 2 will be explained. In Figure 2, INT ₂
~INT ₅ is the output terminal OT ₉ of the circuit shown in Figure 1,
Input terminals connected to OT ₁₀ , OT ₅ , OT ₁₁ respectively, Q ₆ is supplied to input terminal INT ₂ and resists the FF signal
Transistor with base input via R ₃₇ , Q ₇
is the REW signal supplied to the input terminal INT ₃ through the resistor R ₃₈
Q ₈ is a transistor that takes the output of transistor Q ₆ as its base input through resistor R ₃₉ , Q ₉ is a transistor Q ₇
A transistor whose base input is the output of _Q10 through a resistor _R40 , which is connected to the power supply V through a transistor _Q8 .
A transistor connected between _cc and ground, _Q11 is a transistor connected between power supply _Vcc and ground via transistor _Q9 , RM is a transistor _Q8 ,
Reel motor connected between Q ₁₀ and transistors Q ₉ and Q ₁₁ , D ₄₄ is connected to transistor through resistor R ₄₁
A resistor connected between the collector of Q ₆ and the collector of transistor Q ₉ , D ₄₅ is a diode connected through a resistor R ₄₂ between the collector of transistor Q ₈ and the collector of transistor Q ₇ , D ₄₆ is a diode D ₄₄
D ₄₇ is a diode connected between the anode of diode D ₄₅ and the base of transistor _{Q 11 ,} Q ₁₂ is a diode that connects the signal input to the input terminal INT ₄ This transistor Q ₁₂ is connected to the base of the transistor Q ₁₂ via a resistor R ₄₄ and a capacitor C ₁ between the power supply V _cc and the ground _{. Q13} is a transistor whose base input is the output of transistor _Q12 via a resistor _R45 , and _Q14 is a transistor _Q13.
Q15 is a transistor that is turned on by the output of transistor _Q14 ,
_Q16 connects the outputs of transistors _Q6 and _Q7 to diodes
A transistor is turned on as an input through D ₄₉ and D ₅₀ to bring the base _of transistor Q ₁₅ to ground _potential . The power supply Vcc is supplied to the base of transistor _Q16 , and when the headstand is located later, the power supply _Vcc is switched to be supplied to the base of transistor _Q14 . SOL is a solenoid operated by the output of transistor Q ₁₅ to move the head platform forward or backward; Q ₁₇ is the input terminal.
A transistor whose base input is the STP signal supplied to INT ₅ through a resistor R _46. Q ₁₈ is turned on by the output of transistor Q ₁₇ and becomes a transistor.
A transistor that connects the emitter of _Q16 to ground,
_Q19 is a transistor that is turned on by the output of transistor _Q12 , _Q20 is a transistor whose base input is the output of transistor _Q19 via resistor _R47 , and CM is connected to the power supply _Vcc and ground via transistor _Q20 . capstan motor connected between
D ₅₁ and D ₅₂ are diodes that connect the collector of transistor Q ₁₉ and the collectors of transistors Q ₆ and Q ₇ , and D ₅₃ is the base and input terminal of transistor Q ₁₂ .
This is a diode that connects _INT5 through resistor _R48 .

In a circuit configured in this way, for example,
When AM switch S ₃ is operated, pull-up resistor R ₈
The input terminal C of the radio control circuit LC, to which the backup power supply _BVcc was applied, is grounded via the AM switch _S3 and the lock switch _S10 . As a result, the radio control circuit LC is operated by the backup power supply _BVcc to keep the output terminal c corresponding to the input terminal C at the "L" level. When the output terminal c of the radio control circuit LC is set to the "L" level, this L signal is passed through the resistor 34 and the diode.
The transistor _Q4 is turned on via _D23 and _D2 , and a power control signal is sent from the output terminal _OT6 to control the power supply to be turned on. On the other hand, as the output terminal c of the radio control circuit LC becomes "L" level, the light emitting diode LD ₃ lights up to indicate that the AM broadcasting mode has been selected, and the "L" level is output from the output terminal OT ₃ . ” level AM selection signal is sent to control the tuner section to AM mode. In this way, when any of the AUX switch S ₂ , AM switch S ₃ , or FM switch S ₄ is operated, the power is turned on with a single operation, and the tuner section or source selection section is controlled to the mode corresponding to the operation switch. Ru. Therefore, in this state, the desired broadcast can be received by performing a dial operation.

Next, when the off switch _S1 is operated, the input terminal A of the radio control circuit LC goes to the "L" level, and accordingly, the output terminal a is also held at the "L" level. As a result, an output signal of "L" level is sent from the output terminal OT ₁ to control the power supply section to turn off, and also lights up the light emitting diode LD ₁ to indicate that the power supply is controlled to be turned off.

Next, when a cassette is set in the cassette deck, cassette switch _S11 detects that the cassette is set and connects one end of each switch _S5 to _S8 to ground via lock switch _S10 as shown in the figure. do. In this state, when the play button _S5 of the cassette deck is operated, the input terminal E of the radio control circuit LC goes to the "L" level, and the output terminal e is accordingly set to the "L" level. When the output terminal e becomes “L _” level, the transistor _{Q 4}
The base of the transistor Q4 becomes "L" level, and accordingly, the transistor _Q4 is turned on, and the power supply section is controlled to be turned on as described above. Furthermore, since the output terminal e is set to the "L" level, the light emitting diode LD ₅ lights up to indicate the play mode, and a signal is transmitted from the output terminal OT ₅ to the input terminal INT shown in FIG. Supplied to ₄ . As a result, the signal turns on transistor _Q12 , and in conjunction with this, transistor _Q19 turns on with a slight delay due to capacitor _C1 and resistor _R44 . When the transistor _Q19 is turned on, the transistor _Q20 is turned on, and the capstan motor CM rotates accordingly. On the other hand, transistor
As Q ₁₂ turns on, transistor Q ₁₃ turns on. When the cassette is installed, the head stand is located at the rear, and the head stand switch _S18 is connected to the power source _Vc , contrary to the illustration.
_c is supplied to the base of transistor _Q14 . Therefore, in this state, when transistor Q ₁₃ is turned on, transistor Q ₁₄ is also turned on, and accordingly transistor Q ₁₅ is turned on. When transistor _Q15 is turned on, solenoid SOL
is activated to move the head stand forward and bring the head surface into contact with the tape. When the solenoid base completes its forward movement, the head base switch _S18 switches to the state shown, and the transistor
Q ₁₄ and Q ₁₅ are turned off. Therefore, the solenoid
Power to SOL is short-term. In this manner, when the head stand is set forward, the head reads and outputs the recorded contents of the tape being moved at a constant speed by the capstan motor CM.

Next, for example, when the stop switch S ₉ is operated, a signal is transmitted from the output terminal OT ₁₁ to the input terminal shown in Fig. 2.
Feeds INT ₅ . As a result, transistor Q ₁₇
is turned on by the signal, and transistor _Q18 is accordingly turned on. transistor
When _Q18 is turned on, transistor _Q16 , whose base is supplied with the power supply _Vcc through the cassette table switch _S18 , is turned on. When transistor Q ₁₆ turns on, transistor Q ₁₅ turns on accordingly, activating solenoid SOL and moving the head platform backward. Then, when the head stand is moved later, the head stand switch _S18 is switched to the opposite state as shown, and the solenoid SOL is instantly de-energized as described above. On the other hand, during play, the output terminal e of the radio control circuit LC is "L".
In a play mode, the stop switch
As _S9 is operated, the output of AND gate _G1 becomes "H", and the inverter
The output of IN ₁ becomes “L”. As a result, when the stop button is operated during play, the power supply section is controlled to be turned off and all circuits are rendered inactive, similar to when the off switch _S1 is operated.

Next, if there is a cassette tab, the tab detection switch 12 is turned on, and when the record button _S6 is operated in this state, the flip-flop FF ₁ is set by the "L" output of the switch _S6 . and outputs an "H" output from the output terminal Q. This "H" output is outputted as a REC signal via the output terminal _OT7 , and is inverted by the transistor _Q1 and outputted as a signal from the output terminal _OT8 to set the recording circuit. Also, transistor Q ₁
As the output becomes "L", the light emitting diode LD ₆ lights up to indicate that recording is in progress. Furthermore, since the output of the transistor _Q1 becomes "L", the transistor _Q4 is controlled to be turned on via the diode _D28 , thereby turning on the power as described above. Furthermore, since the output of the transistor _Q1 is set to "L", the output terminal _OT5 is set to "L" via the diode _D29 , and a signal is supplied to the input terminal _INT4 in Fig. 2. . As a result, the cassette control section shown in FIG. 2 controls the drive section of the cassette in the same mode as in the play mode to record the input signal on the tape. In this recording mode, in order to prevent a direct transition from the play mode to the recording mode, the signal at the output terminal e of the radio control circuit LC is used as the reset input of the flip-flop _FF1 via the diode _D7 . By doing this, the output terminal e of the radio control circuit LC will always be at "L" level during the play mode.
Flip-flop _FF1 , which has priority on reset, is never set, and only after being set to stop mode can it enter recording mode, thereby preventing malfunctions. Furthermore, when the recording switch _S5 is operated in the fast-forward and rewind modes, the "L" output that is output in both modes is incorrectly input to the reset input () of the flip-flop _FF1 via diodes _D30 to _D31 . Therefore, it does not switch directly to recording mode.

Next, when the fast-forward switch _S7 is operated, flip-flops _FF1 and _FF3 are forcibly reset and flip-flop _FF2 is set, and accordingly, its output Q is set to "H" and the output terminal is The FF signal from OT ₉ is supplied to input terminal INT ₂ in FIG. Further, the transistor _Q2 is turned on by the "H" output of the flip-flop _FF2 , and accordingly, the light emitting diode _LD7 , which indicates the fast-forward mode, lights up. On the other hand, the transistor _Q6 connected to the input terminal _INT2 is turned on by the FF signal. When transistor _Q6 is turned on, transistor _Q20 is turned on via diode _D51 , thereby driving capstan motor CM. Also, transistors Q ₁₆ and Q ₁₅ are turned on via diode D ₄₉ , thereby energizing the solenoid SOL and moving the head stand rearward as described above. On the other hand, when transistor Q ₆ turns on, transistor Q ₈
turns on. Then, when the transistor Q ₈ is turned on, its output is supplied to the base of the transistor Q ₁₁ via the resistor R ₄₂ and the diode D ₄₇ , and accordingly, the transistor Q ₁₁ is turned on. As a result, the reel motor RM has a power supply _Vcc - transistor Q ₈ - reel motor RM - transistor Q ₁₁ -
A current flows in the direction of the arrow through the ground path, and this causes the reel motor RM to rapidly advance the tape.

Next, when rewind switch _S8 is operated in the stop mode state, flip-flop _FF3 is set and other flip-flops _FF1 ,
FF ₂ is forced to reset. And the set output Q of this flip-flop _FF3 is the output terminal
It is output as a REW signal from OT ₁₀ , and
The light emitting diode LD ₈ is turned on to indicate the rewind mode. On the other hand, in Fig. 2, the transistor Q ₇ connected to the input terminal INT ₃ is connected to the resistor R ₃₈
It is turned on by the REW signal supplied via. When transistor Q ₇ turns on, transistor Q ₉ turns on, and part of its output is supplied to transistor Q ₁₀ via resistor R ₄₁ and diode D ₄₆ , which also turns on transistor Q ₁₀ . As a result, the power supply V _cc - Transistor Q ₉ - Reel motor RM -
Transistor Q ₁₀ - Current flows through the earth path,
The reel motor RM rotates in the opposite direction to that described above to rewind the tape at high speed. In this case, if the rewind operation is performed while the head stand is in the front position, such as in play or record mode,
To prevent damage to the tape, the head stand must be moved backwards. This operation is performed using diode D ₅₂ , similar to that described in the fast forward mode above.
The transistor Q ₂₀ is turned on and the capstan motor rotates, and the diode D ₅₀ is turned on.
This turns on transistor _Q16 , which turns on transistor _Q15 , which turns on the solenoid.
SOL is energized and the head stand moves backward.

Next, in either play or record mode, when you operate any switch S ₁ to _{S 4} for Off, AUX, AM, or FM, the radio control circuit LC
Since the output terminal e of is already at “L” level,
The output of AND gate _G2 becomes "H". Then, the output of the inverter _IN2 which inverts the output of the AND gate _G2 becomes "L", and is output as a signal via the output terminal _OT11 of this "L" output. As a result, the cassette control section shown in FIG. 2 controls and maintains the cassette mechanism in the stop mode. The above explanation is for the radio mode and cassette mode.

Next, cue control and repeat control will be explained. First, when _{the fast forward switch S7 or} the rewind switch _S8 is operated with the cue switch S12 turned on, the Noah gate _G4 detects the outputs of the flip-flops _FF2 and _FF3 and switches the FF/FF.
Outputs “L” signal only in REW mode. On the other hand, when the song interval signal PMS indicating that a song gap has been detected is input to the input terminal INT ₁ , the transistor Q ₅ turns on and an “L” output is supplied to the AND gate G ₃ via the diode D ₄₀ . be done. As a result, all the inputs of AND gate _G3 become "L", and accordingly, "H" output is sent out.
The output of AND gate _G3 is inverted by inverter _IN3 , and its "L" output is supplied to the reset inputs of flip-flops _FF2 and _FF3 via diode _D41 , thereby resetting FF/REW. In addition, since the output of inverter IN ₃ is also supplied to the output terminal of play switch S ₅ , that is, the input terminal E of radio control circuit LC, when a song interval is detected, the play mode is automatically switched back from FF/REW. Then, cueing control is performed.

Next, with the cue switch S ₁₂ turned on, the one-track repeat switch
When the play mode is set by switching S ₁₅ and S ₁₆ in the opposite direction to that illustrated, the transistor Q ₅ is turned on or the end switch S ₁₇ is turned on by the song interval detection signal PMS at the end of the play of the song. As a result, the transistor _Q5 or the end switch _S17 becomes “L”.
The output is set through the one-track repeat switch S ₁₅ or S ₁₆ and the flip-flop FF ₃ via the diode D ₄₂ , as well as the flip-flops FF ₁ and FF _2.
Reset. Therefore, the cassette section automatically shifts from the play mode to the rewind mode when the song being played ends. In this rewind mode, the output of flip-flop _FF3 becomes "H", so the output of NOR gate _G4 becomes "L".
When the inter-music signal PMS arrives, the "L" output of the transistor _Q5 causes the gate _G3 to carry out cue control as described above and return to the play mode.

Next, when the play mode is set with only the cue switch _S1 and one side repeat switch _S14 set and connected in the opposite way as shown, the end of the tape is detected and the end switch _S17 is turned on. As a result, the "L" output of switch _S17 sets flip-flop _FF3 through switches _S16 , _S14 and diode _D42 , and resets flip-flops _FF1 , _FF2 to rewind mode.

When the end switch S ₁₇ is turned on while the switches S ₁₂ , S ₁₄ , S ₁₅ , and S ₁₆ are in the state shown in the figure, the switch is turned on.
The "L" output of _S17 resets all flip-flops _FF1 to _FF3 through switches _S16 , _S14 and diode _D20 , and also puts the radio control circuit LC into off mode, and outputs it through diode _D21 . Outputs a stop signal to terminal OT ₁₁ .

Next, play is performed with the memo switch _S19 set, and then the rewind mode is set. When the memo switch _S19 is rewound to the memo position, the switch _S19 is turned on. As a result, the output of NAND gate _G5 is “L”
Thus, the same stop control as when the above-mentioned end switch _S17 is turned on is performed.

In FIG. 1, if the lock switch _S10 is set in the opposite direction to that shown in the figure, "H" level will be applied to all the function switches _S1 to _S9 , and accordingly, Since the switch is locked, erroneous operation is prevented. Also, if the cassette is not set, the switch
Since _S11 is switched in the opposite direction as shown, the "H" level is applied to the cassette system function switches _S6 to _S9 and they are locked.

As explained above, the cassette device according to the present invention determines the coincidence between the tape play output and the AM/FM switch output, and controls the tape recorder to stop based on the coincidence output.
When changing from tape play mode to radio reception, there is no need to control the cassette device to stop as in the past, change from tape mode to radio mode, and then operate the AM or FM switch. By simply operating the AM or FM switch, you can receive the selected AM or FM broadcast after the cassette device is automatically stopped, and the operation has excellent effects with just one touch.

[Brief explanation of the drawing]

FIGS. 1 and 2 are circuit diagrams showing one embodiment of a control circuit that uses a radio cassette device according to the present invention. S ₁ to S ₉ ...Function switch, LC...Radio control circuit, FF ₁ to _{FF 3} ...Flip-flop, Q ₁
~ _Q20 ...transistor, _D1 ~ _D53 ...diode,
LD ₁ to _{LD 8} ...Light emitting diode, _G1 to _G4 ...Gate,
IN ₁ ~ IN ₃ ...Inverter, RM...Reel motor,
CM...Capstan motor, SOL...Solenoid.

Claims (1)

[Claims] 1. A radio control circuit which is constantly supplied with power by a backup power supply and receives input from various function switches, off switches, and tape play switch outputs in radio mode, and holds and outputs outputs corresponding to the inputs; A flip-flop which is set by the outputs of fast forward and rewind switches, reset by the outputs of other switches including an off switch, and whose set outputs perform recording, fast forward and rewind controls, and a radio control circuit. Equipped with a gate circuit that matches the tape play output of the FM switch with the AM/FM switch output and controls the cassette to a stop state based on that output. A radio cassette device characterized by automatically switching to FM reception mode.