oxygen454
New Member
Hey guys I am new to this forum so go easy on me haha.
I am building a 3 stage monostable 555 timer circuit for my street light I got off a friend that works for the city traffic control. I have the first part built with 555 ic's that turn one LED on then when timed out, turning the next one on... green, yellow, red. I ran into some problems along the way. I have been all over the net and cant seem to find any answers.
What the circuit does is the 555's send a trigger voltage to the triac which in turn, turns on the AC to the light. The trigger voltage is 9volts from the 555 ic to the triac.
1. First problem is, I want to trigger the AC part of the circuit with a triac but I don’t know how to hook it up and what the pin-outs are. It says 15A/400V …I think the letters/numbers are MRC15 0134 (kind of hard to read small print). I originally thought that the middle was the low voltage trigger and the left and right pins were the higher voltage leads but I haven’t had it working. I tried it on 9 volts before using 110vac and blowing everything up haha!
2. My transformer is a 650-122 12VCT 2Amp with 2 wires for AC and 3 out for DC. How do I hook this up?
3. How can I get 9 volts after the transformer to run the 555’s? I have the circuit built for 9 volts and was wondering if I could use a resistor off the transformer to lower the voltage from 12 to 9?
Any help would be much appreciated!! I am going to build a website on this when I am done if not before.
I am building a 3 stage monostable 555 timer circuit for my street light I got off a friend that works for the city traffic control. I have the first part built with 555 ic's that turn one LED on then when timed out, turning the next one on... green, yellow, red. I ran into some problems along the way. I have been all over the net and cant seem to find any answers.
What the circuit does is the 555's send a trigger voltage to the triac which in turn, turns on the AC to the light. The trigger voltage is 9volts from the 555 ic to the triac.
1. First problem is, I want to trigger the AC part of the circuit with a triac but I don’t know how to hook it up and what the pin-outs are. It says 15A/400V …I think the letters/numbers are MRC15 0134 (kind of hard to read small print). I originally thought that the middle was the low voltage trigger and the left and right pins were the higher voltage leads but I haven’t had it working. I tried it on 9 volts before using 110vac and blowing everything up haha!
2. My transformer is a 650-122 12VCT 2Amp with 2 wires for AC and 3 out for DC. How do I hook this up?
3. How can I get 9 volts after the transformer to run the 555’s? I have the circuit built for 9 volts and was wondering if I could use a resistor off the transformer to lower the voltage from 12 to 9?
Any help would be much appreciated!! I am going to build a website on this when I am done if not before.