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Design help: Modulator schematic
"Brenda Ann" wrote As others in the other group have mentioned, you're pushing your luck with 600V diodes. They have over 700V on them (or they would have if things were working right). Replace them with 1000V diodes. This also means you need to replace those capacitors with 1000V capacitors, preferably AC rated. As someone else said, you have a major problem with the power supply. The output voltage should be much higher. -- I think I have kenned out what that problem IS. It's not a 250-0-250.. it's a 125-0-125 on the secondary.. which would output pretty much what I'm getting. This is my transformer. From Mouser http://www.hammondmfg.com/pdf/5c0030.pdf #261G6 261G6 45250V C.T.@ 130 ma 6.3V @ 2A 1 4.00 2.50 2.63 3.56 2.0 What is the modulation transformer you're using? If it's a mains transformer it could be going into saturation. Proper modulation transformers are designed to accomodate a d.c. bias through the windings which normally requires an airgap in the core. In an ungapped core the dc bias will drive the core somewhere up the BH curve and the effects will be exactly as you describe - clipping on one of the peaks |
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