negative to positive inverter

I would like to make my own door lock - to + inverter. For installs on keyless entry units on vehicals like GM and some Dodges. I have taken the inverter modules apart and they seem pretty simple. But I would like to know what parts I would need and how to wire it up. Thaks.Solartech Window Tinting and Electronics,contract installer

A relay..... ?

i'm guessing he's referring to the ones with the transistors in them. googling 'transistor circuits' should give a few choices with tutorials. mark

Yes I know I could use 2 relays but I would like to it with transistors and I think a rectifier dioed.Solartech Window Tinting and Electronics,contract installer

Done both, relays tend to be more reliable, but either Oldspark or Mr. Idiot can help with the circuitry, PNP power transistor + 47Kohm resistor + a diode.

I can't see the point. A DEI 451M is designed to do this exact same thing...Mike M2

Tech Manager

CS Dealer Services

If it's a cost factor I go to Radio Spares (= Farnel or Mouser in the US) I buy "mini" or PCB relays, diode them, wire them up as DEI 8616 and the cost is about 1/3 the DEI product less my time though I make up about 10 at a time.

I would run a 470 ohm resistor in to the base of a PNP transistor (like a 2n3906). The other end of the 470 ohm resistor would be your (-) input. I would connect the emitter to 12vdc I would connect the collector to a 22 ohm resistor. The other end of the 22 ohm resistor is your (+) output. I would connect a diode between the (+) output and ground. The 470 ohm resistor provides your base current. The 22 ohm resistor protects the output from excessive current that can damage the transistor. The diode protects the transistor from reverse voltage spikes caused by the collapsing of magnetic fields most commonly found in relays.Kevin Pierson

KPierson wrote: I would run a 470 ohm resistor in to the base of a PNP transistor (like a 2n3906). The other end of the 470 ohm resistor would be your (-) input. I would connect the emitter to 12vdc I would connect the collector to a 22 ohm resistor. The other end of the 22 ohm resistor is your (+) output. I would connect a diode between the (+) output and ground. The 470 ohm resistor provides your base current. The 22 ohm resistor protects the output from excessive current that can damage the transistor. The diode protects the transistor from reverse voltage spikes caused by the collapsing of magnetic fields most commonly found in relays.

contract installer..... what is your time worth?

but the transistor is elegant, and the relay, brute force.  learning can be fun for the one who tries.