- Thu Mar 08, 2012 11:09 am
#140859
done and done, schematics/PCB updated.
Mee_n_Mac wrote:They are LEDs, and the current limiting resistors are built into the cluster already. I'm just providing a ground path that is normally switched on by the CPU of the cluster.hassmaschine wrote:The transistors are basically acting as relays to turn on the indicator lights (left turn signal, right turn signal, high beam, fog light, and two ABS indicators). Since I'm not using the light control computer that goes with this cluster, i need to turn them on manually. The signals on my car are active high (12v), while the signal lights on this cluster are active low (ground). I've tested it already and they work flawlessly.Are the indicators some type of incandescent light bulb or LEDs ? If they are the former you could forgo the resistors from 5V to the collectors and perhaps even the diodes, and just attach the bulbs to the 2N2222 collectors. It'll save space, parts and electricity. If the indicators are LEDs then your circuit may work but eventually I predict LED failures as there doesn't seem to be any current limiting resistor(s).
Yeah, I need another inverting op-amp to dim the LED backlights with the stock light switch. same thing as the gas gage, just a different scale.hassmaschine wrote:For the dimmer, I could just use 10k, 10k, 13k, and 14k, right? I'm not actually very worried about the dimmer circuit - it doesn't need to be super accurate. I just want some control over the brightness and for it to be linked to my stock dimmer switch. Otherwise I was just going to hook it straight up to 12v with a resistor.Dimmer ? What dimmer ? Is this the op-amp circuit with 100's of ohms ? If so yes, 10K - 14K in place of 100 - 140 ohms is good.
hassmaschine wrote:any suggestions on a cap size? I probably have a bunch laying around actually.100 nF is typical.
done and done, schematics/PCB updated.