Simple flasher on NE555 timer
A very simple flasher can be assembled using the NE555 chip, which is quite common among radio amateurs. The circuit contains a small number of elements and allows you to control one or two LEDs.
The microcircuit contains a multivibrator that generates rectangular pulses. The length of these pulses can be changed by selecting a 10 µF capacitor and a 220 kOhm resistor. The circuit uses two LED, which are switched on alternately. But if you want to use only one Light-emitting diode, then the second one can simply not be included in the circuit - this will not affect the performance of the entire device.
The circuit is powered from 3 V, but the power can be in the range of 3-15 V; the microcircuit allows this; only when the power changes upward, it will be necessary to select resistors in the circuit LEDs. If you power the flasher from 12 V, then replace the resistors with 1.5-2 kOhm.
After assembly, the flasher does not need adjustment and starts flashing immediately after switching on. Instead of a 220 kOhm resistor, you can solder a variable or tuning resistor to adjust the blinking frequency you need LED.
I assembled the circuit on a breadboard. Also, due to the minimum of components, the entire device can be assembled by hinged mounting and filled with hot glue. I used this scheme in my car, I’m happy with the result, everything works stably to this day.
Circuit of a simple flasher on NE555
The microcircuit contains a multivibrator that generates rectangular pulses. The length of these pulses can be changed by selecting a 10 µF capacitor and a 220 kOhm resistor. The circuit uses two LED, which are switched on alternately. But if you want to use only one Light-emitting diode, then the second one can simply not be included in the circuit - this will not affect the performance of the entire device.
The circuit is powered from 3 V, but the power can be in the range of 3-15 V; the microcircuit allows this; only when the power changes upward, it will be necessary to select resistors in the circuit LEDs. If you power the flasher from 12 V, then replace the resistors with 1.5-2 kOhm.
After assembly, the flasher does not need adjustment and starts flashing immediately after switching on. Instead of a 220 kOhm resistor, you can solder a variable or tuning resistor to adjust the blinking frequency you need LED.
I assembled the circuit on a breadboard. Also, due to the minimum of components, the entire device can be assembled by hinged mounting and filled with hot glue. I used this scheme in my car, I’m happy with the result, everything works stably to this day.
Watch the video of the assembly and operation of the flasher on the NE555
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