3 Simple Metronome circuits using transistors

These circuits are Simple Metronome circuit model to be simple. It use the transistor be important equipment by very the circuit is the character Astable Multi vibrator. For produce something the sound beep.

3 Simple Metronome circuits using transistors


Simple Metronome circuit using transistors

Simple Metronome circuit

We can adjust VR1 for get the sound tone the Generator follow can want. A loudspeaker that use to is supposed to impedance 8 – 32 ohm railing land. For decrease the popularity will down and may lead , output , go to feed reach still the amplifier microphone has changed , capacitors 10 uF. The detail is other , see in the circuit.

Read also: How does a transistor circuit work

Simple signal generator circuit using 2N3906

Simple signal generator circuit by 2N3906

This circuit is a simple signal.It can generate signals, both light and sound Alternating.Which can be applied to work. For example Taillight of bicycle or Turn left and the right of the bicycle. Etc.
When entering into power supply circuit. by circuit will have Q1 and Q2 to be astable multi vibrator. This will work in any way ON and OFF.Or vice versa on all the time.And Pin Collection (C) of the two transistors.Connected to the light source device (LED1-LED4).For the audio source device is Buzzer BZ1.While the one ON transistor will allow the device is connected to pin C is running.The signal alternates between light and sound all the time.

Small Metronome using 2N3904 or “Simple Tone Oscillator Generator by 2N2222”


This is knock the melody. It uses begin flasher circuit in building sound click keen go up at a loudspeaker. But each time at PNP-transistor, Q2 type(2N3906-2N2907-or-BC558) work by origin frequency circuit that use RC and Q1-NPN transistor-type(2N3904 or 2N2222-or BC549) ,R2-potentiometer–50K is used for fine working rate repeatedly through 20-280 sections time per minute(tone), By value change of C1 (0.1uF to 22uF) will change the tone of voice in the sound click at happens.
As video below hear tone of speaker 8 ohms. and use 9-volts battery.


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11 thoughts on “3 Simple Metronome circuits using transistors”

  1. “Simple Tone Oscillator Generator by 2N2222”

    I have built this circuit, using A733 PNP and C945 NPN with excellent results.

    You can get different (i.e. higher pitched) tones by messing with the capacitor value from 22uF to .1uF electrolytics, and whatever other capacitors you may have in your parts box.

    By changing the 10K resistor from fixed to variable, you can increase the voltage going to the circuit, but at the risk of the transistors failing via overheating/overvoltage.

    Using different components in the circuit with a 4 Ohm, 0.5 Watt speaker yields even more tones, some of which change with a light touch of the speaker.

    Overall, a very good circuit, easy to build, a fun and loud noisemaker. I (as well as others who have tried it) thank you for putting this up.

  2. I could not get mine to work. I was using a breadboard, 1 2N3904, 1 2N3906 and 22 uF capacitor and 1 10 k resistor and 50k trimmer resistor. And a piezo transducer. Do I really need a speaker?

  3. @Adam

    From what I understand, the 22uF capacitor serves to add the negative part of the voltage.

    These types of loudspeaker can only work with AC voltage, whereas Piezos run off DC.

    Maybe take out the 22uF cap and try again?

  4. Hi Rob Darrough i think you need to have a look of the datasheet 3904 transistor and also for 3906 to understand what voltage they bears. Well if we try this circuit without a potentiometer by putting a 50k resistor it will work well. Also if you want to apply more voltage you can put a resistor between emitter of 3906 and the DC power point

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