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Subject: Help, A DC flasher with adjustable on and off time using a PUT and 2 SCRs

Date: 07/17/03 at 7:23 PM
Posted by: Rob
E-mail: phatraver@hotmail.com
Message Posted:

Image of circuit.

I am having problems making this circuit work, I got it from a circuit book that had lots of them in it. It included very little info about the circuit. I am questioning the orientation of the PUT or something. I built this circuit with NTE verified parts, a NTE6402 PUT, 2 NTE5452 SCRs and NTE177 and NTE 125 diodes. All resistors, and capacitors are stated values, except one of the POT's they are both 50ohm pots instead of the 50 and 150 values the circuit called for. I couldn't find a 150ohm pot. And the 5uf cap is 4.7uf for me. Please help! I really need this to work for a load that requires 12vdc pulling .22 amperes. I am powering the circuit with 12v and the PUT, resistors around the gate are getting too hot to touch, the diode NTE177 is also getting hot closest to the PUT so i disconnect it all. My load is ON but not flashing at all. Or turning off at all. When I power this circuit with a 9v it will turn off and on when I play with the POT's but only once, not a constant flash. At 9v it does not get hot at all. I don't know what to do from here.

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