mrdexterous
New Member
Hello Again, I have a switchpack for an actual traffic light. The switchpack consists of 3 triacs, 3 sample LEDs and so on. There are 3 leads coming from the negative side of each of the test LEDS and one main lead coming from the postive side of all the LEDS (there is a trace connecting them). When you apply +12V DC to the postive side then touch any of the 3 remaining leads to ground (-12V) The same LED will turn on. This simulates that the Triac is working and will turn on and allow 120V AC to flow through it turning on a Bulb.
My problem is, my timing circuits are all backwards. For example my led is connected to ground and awaits a positive pulse to turn it on whenever the counter cycles to it. However the switchpack is always connected to +12V DC awaiting a negative pulse to turn it on. Can anyone offer me advice on how I can build a different circuit so I can implement my switchpack?? Many thanks to all who take the time to read this post.
My problem is, my timing circuits are all backwards. For example my led is connected to ground and awaits a positive pulse to turn it on whenever the counter cycles to it. However the switchpack is always connected to +12V DC awaiting a negative pulse to turn it on. Can anyone offer me advice on how I can build a different circuit so I can implement my switchpack?? Many thanks to all who take the time to read this post.