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Jaref, You mention "Ferroresonent are good for this application, small, inexpensive and reliable". I have never heard of this type of protection device. Can you give me some input on where I can get specs on this? I currently have several devices on order to check their supression...

I have an International Microsystems Programmer (model M3016A) and am having trouble with it. I can't seem to get any information on the company. Does anyone know if they are still in business, what company bought them, how I can fix this unit (is there schematics available for obsolete products)?

This compressor motor is powered from the same AC input as the switching power supply. The output of the power supply is filtered and runs remote devices (spike protection was added to the output because of the devices turning on and off).

First, let me say that only one distibutor (out of 30) has a problem, and they connect the compressor with about 2' of wiring to the input of the switching power supply. The compressor is a very small, single phase compressor (Sears brand, $50, user supplied). There is no SCR control, it...

I cannot seem to find any information on the effects of hooking up a compressor or other AC motor to sensitive electronic equipment. I know the motor produces spikes and surges and is destroying switching power supplies in our products. Does anyone know if there are papers or information on...