A simple flasher on one transistor

Electronics / Simple circuits 135 224 9

There is a strong need to force Light-emitting diode flash to enhance attracting a person's attention to the signal. But to make a complex circuit there is simply no time and space to place radio elements. I'll show you a diagram consisting of just three that will make Light-emitting diode blink.

The circuit works well on 12 volts, which should be of interest to motorists. If we take the full range of the supply voltage, then it lies in the range of 9-20 volts. So this device can find a lot of applications.

This is a truly super simple circuit to provide flashing. LED. Of course, the circuit contains a large electrolytic capacitor, which can steal a lot of space, but this problem can be simply solved by using a modern element base, such as an SMD capacitor.

Note that the base of the transistor is hanging in the air. This is not a bug, but a design of the circuit. The base is not used, since the operation uses the reverse conductivity of the transistor.

Such a flasher can be assembled by hanging installation in about fifteen minutes. Put on the heat shrink tube and blow it with a hot air gun. And now you have a generator for blinking LEDs.The blinking frequency can be changed by increasing or decreasing the capacitance of the capacitor. The circuit does not need to be configured and works immediately if the circuit elements are in working order.
The flasher is very economical to operate, reliable and unpretentious.

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Comments (9)

#1 Vladimir Guests 30 October 2017 17:08
2

My friend, I could mention that in this circuit the transistor operates in avalanche breakdown mode. Good luck.
- Answer
1. #2 Nikita Guests 10 January 2020 18:50
  1
  
  Is this really a transistor feedback circuit, as indicated by the author? Or was the transistor selected specifically for breakdown? How quickly will it fail?
  
  Answer
#3 Alexei Guests November 22, 2017 07:55
6

Something does not work
- Answer
#4 Masik Guests 10 May 2019 22:17
4

I assembled it with a regular 3V red LED - it glows, but does not blink. I changed the capacitance of the capacitor and the resistance of the resistor, but no effect was achieved... (((
- Answer
#5 YuraSoft Guests 29 January 2020 22:32
0

but no one noticed that this was the 361st, the 315s have the manufacturer’s emblem next to the letter
- Answer
#6 Konstantin Guests 7 March 2020 13:09
1

everything works great, thanks. please tell me, is it possible to add a power transistor so as not to LEDs ignite, but a more powerful load needs to be powered with only 1 ampere, I’m waiting for an answer. please
- Answer
1. #7 wow Guests 12 April 2020 16:58
  2
  
  solid state relay instead LED put
  
  Answer
#8 Guest Konstantin Guests 30 August 2020 18:17
4

Or maybe three? LED put in this circuit????
- Answer
#9 Guest Alexander Guests 10 March 2021 21:56
0

In general, you will have to select a transistor to operate in avalanche breakdown mode - perhaps from a pile of about 20 pairs it will work. This circuit is called a relaxation generator. Initially it was built on various variations of neon lamps... You can try putting a zener diode in series with the LED instead of a transistor. Total zener voltage and forward voltage LED choose 2-3 volts below the power supply voltage. But we must remember that the duration of combustion in such circuits will greatly depend on the capacitance of the capacitor and will never be long.
- Answer