Hi all,
I have a circuit that @crutschow helped me with in 2016. I have 6 Fog Lights on my car and I wanted the outer Left/Right Foglamps to mimic Turn signals. See old post ..
https://forum.allaboutcircuits.com/threads/convert-this-circuit-to-mosfets.126731/page-3
The mosfets were working, but getting hot. So I wanted to add 2 more Mosfets (one Mosfet per 55W 12V Bulb) and have a Optocoupler (PC814/EL814) trigger the circuit. It works, kinda. See Circuit below
With the newer OPTO trigger circuit, the Mosfets turn on and my Foglamps work. But only D1 Main status LEDs work. D3 and D4 do NOT work. I even swapped out the limiting resistors (R9 & R11) to 100ohms. Nothing. So I thought that OPTO was too weak and shorted out the (E and C) of the OPTO. Now the D3&D4 status LEDs are on. However, when 12V is applied to the (Right turn / Left Turn) inputs terminal of P2. The Q5 and Q6 do NOT shut-off. All 6 Mosfets remain on.
I did use Proteus to Simulate the circuit and it worked fine. Just not in real life ... Any guidance would be much appreciated.
Thank you,
TONY
I have a circuit that @crutschow helped me with in 2016. I have 6 Fog Lights on my car and I wanted the outer Left/Right Foglamps to mimic Turn signals. See old post ..
https://forum.allaboutcircuits.com/threads/convert-this-circuit-to-mosfets.126731/page-3
The mosfets were working, but getting hot. So I wanted to add 2 more Mosfets (one Mosfet per 55W 12V Bulb) and have a Optocoupler (PC814/EL814) trigger the circuit. It works, kinda. See Circuit below
With the newer OPTO trigger circuit, the Mosfets turn on and my Foglamps work. But only D1 Main status LEDs work. D3 and D4 do NOT work. I even swapped out the limiting resistors (R9 & R11) to 100ohms. Nothing. So I thought that OPTO was too weak and shorted out the (E and C) of the OPTO. Now the D3&D4 status LEDs are on. However, when 12V is applied to the (Right turn / Left Turn) inputs terminal of P2. The Q5 and Q6 do NOT shut-off. All 6 Mosfets remain on.
I did use Proteus to Simulate the circuit and it worked fine. Just not in real life ... Any guidance would be much appreciated.
Thank you,
TONY