In the book I am following the following circuit is given:
The book states that as soon as we apply power to the circuit, the LED should start flashing.
However, this doesn't happen in my circuit. As soon as I apply power to my circuit, the LED flashes once and stays off after that.
What might be the reason my circuit does not work? I am giving my circuit below:
Since I don't have exact resistor values, I have made R2 out of 10K Ohm and 4700 Ohm resistors. And I have made R3 out of two 10K Ohm and one 6800 Ohm resistors.
I don't know which manufacturer's 2N6027 (PUT) I am using but AFAIK their pinouts are always the same.
I am using an AC to DC adapter at 6V as my power supply.
What I have tried up to now:
- Replace R1 with 100K Ohm. Didn't work. Same behavior as before.
- Try transistor's (a user) circuit. Didn't work. This time LED didn't flash even once. The following is transistor's circuit:
- Increase the cap.
- Increase the cap and decrease R3.
- Current at anode starts at 5uA as soon as I power the circuit, and drops to 0uA about a course of 5 seconds and stays at 0 afterwards.
- Current at cathode becomes 1uA momentarily as soon as I apply power and then drops to 0 and stays that way.