January 2012
I have some industrial equipment inherited from a deceased customer. Two transformers, vintage WWII, 10 and 5 KVa and one transformer probably, 15 KVa with SCRs but no control board. This equipment was originally intended for wire heat treat service, 28 VAC secondaries. I have had them 20 years or more. I’ve been trying to cook up a stable circuit for firing SCRs for all the transformers. I have worked with such circuits all my professional life but [now 76 yrs] stability is eluding me. Industrial electrical service is always noisy and welding especially so. I know I need zero crossing sync and I need 0.008 sec to zero sec adjustability for the triggers. It must also be jitter free. This is just a hobby because nobody buys antique transformers except for scrap, which might be my best business decision considering the times. I do have the transformers and the SCRs. My heirs can scrap the units out after my reward. I have lots of scrapables to play with and nothing else but time.
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