Simple Clap Controlled Electronic Switch Circuit Diagram

This electronic switch allows you to control an electronic device by only clapping your hands twice. It is based on three integrated circuits; 741 Op-Amp, 555 timer, and 4013 dual D flip-flop.A 9V battery is ample to operate the circuit.

When you first clamp your hands, mic detects the sound and triggers the 555 timer via the operational amplifier. The timer stretches the signal and applies it to the clock input of the flip-flop. Because of the three state arrangement of the flip-flop , one more clamp is needed to change the output state.

 

 Clap Controlled Electronic Switch Circuit Diagram

 

 

 

 Second clamp sets the flip-flop output to high and this forward biases the 2N2222 BJT. Relay closes so the device connected to the relay switches on. Same procedure applies for the opposite. When you clap your hands twice, relay closes and turns off the device connected to it.

R3 trimpot adjusts the sensitivity of the circuit. You should turn it till the room noise does not effect the switch operation.


    Components


IC1: 741 Op-Amp
IC2: 555 Timer
IC3: 4013 Dual D Flip-Flop
Q1: 2N2222 NPN Transistor
C1, C2, C3, C4: 0.1uF Ceramic Capacitor
C5: 47 uf Electrolytic Capacitor
R1, R2, R4, R5, R10: 10 KOhm
R6: 150 KOhm
R7, R9: 100 KOhm
R8: 1 MOhm
R11: 220 Ohm
R3: 100 KOhm Trimpot
B1: 9 Volt Battery,
K1: SPST Reed Relay 5 Volt DC Coil
MIC: Electret Microphone

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 Soft-Action Mute Switch Circuit Diagram

Potentiometer R2 must be set to the value twice of the transistor's cut-off voltage so the on/off transition times become approximately equal. R2 and D3 discharge C1 swiftly and mute the signal during the power down. In this process, the signal path should remain stable to below 1/3 of the normal supply voltage (In this example below +/-4). Then Q1 - 2N3819 finishes muting. 

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Digital Sound activated Switch Circuit Diagram

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 Simple Dual Trace Scope Switch Circuit Diagram

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Simple Comparator with time out Circuit Diagram

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Audio Operated Switch Circuit Diagram

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Two-channel Audio/Video Switcher Circuit Diagram

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 Simple Digital Switching Circuit Diagram

 

This positive pulse will set OUT1 high. Feedback locks OUTl`s pair of converters in this HIGH state. Meanwhile, the pulse will also pass through diode D1A to the differentiator that is formed by C and R2. The differentiator will shorten the pulse. The shortened pulse goes to all the latches and resets all of them, except the latch that sees the longer setting pulse. Obviously, if you press more than one button at once, more than one output will latch at once.

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Differential Analog Switch Circuit Diagram

 

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 Electronic Push-on Push-off Switch Circuit Diagram

That prevents base current from flowing into Q3 so it is cut off, de-energizing relay Kl. The flip-flop changes state every time SI is pressed. Capacitors Cl and C2 ensure that Ql is always the transistor that turns on when power is first applied to the circuit. When power is first applied to the basic flip-flop, the initial status is random—Ql and Q2 both try to conduct and, usually, the transistor with the higher gain will take control, reaching full conduction and cutting off the other one. 

However, differences in the values of the collector and coupling resistors will also influence the initial state at power-on. With C2 in the circuit, it and R4 form an R-C network that slightly delays the rise in Q2's base voltage. That gives Ql sufficient time to reach saturation and thus take control.

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Electric Zero Voltage Switching Circuits Diagram

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If LEDs are not capable of carrying such a current or an alternative op amp is used and an additional resistor R^ is necessary.

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 Electronic Touch Switch 1 Circuit Diagram

 

 

 

The 60-Hz output from the amplifier is rectified by Dl and D2, then filtered by C3. Potentiometer R3 sets the trigger voltage used to saturate Ql. When Ql turns on, the collector end of R4 goes almost to ground and provides the needed voltage to turn on Q2. Transistor Q2 turns on and clocks. 

 

The flip-flop is configured for toggle-mode operation, so its output switches states with each clock pulse. The 4027 (U2) is wired to toggle by tying the J and inputs high and the set and resets low. Transistor Q3 is connected to the Q output through the 4.7-KOhmhm resistor. Transistor Q3 drives Q4, the relay driver. Be sure that the load does not exceed the relay ratings.

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