I have a Gast Roc-R piston type compressor. model ROA-P101-JK mounted to a speedair 3 gal tank. It's been in our shop collecting dust for years.... This thing is very quiet when running..... the problem is it's 24 volt DC motor....... Now after doing some reserch, I finally purchased a step down transformer to get me to 24 volts AC, I've made a diode bridge to convert the AC to DC but this has caused about a 2 volt loss.......... Now for the tech part.... I reserched and found out it's a 1/8 hp motor and that converts to approx 100 watts.....and to calculate the amps needed 100 watts divided by 24 volts converts to approx 4 amps......... The only transformer I found was rated at 100 watts,(barely enough) but when the compressor gets to around 35psi, it starts straining for power like it needs more amps....... I was really hoping I could make use of this compressor being that it was FREE!!! except the diodes..... one burned up transformer..... a second transformer now that almost fixed the problem....... OK so how many electrical engineers are airbrush artists on here.......... Some of you know what got me into this new hobby so you know I'm determined to get this going..... I know there is a way to get 120 voltAC to power this 4 amp, 1/8hp 24 volt DC motor that wispers when it runs.......