I have designed AC convertors using a small center tap transformer and two transistors, one on each leg with inversion between their bases so that when the drive signal is hi one transistor is on, and when low the other. The drive signal can be controlled by a 555 set for near 60 hz. The main thing is to get a transformer that does not saturate under 9ms, and that the transistor can handle the peak current. You could rate the transistor to be able to handle the current if the 555 stops with an output on or if the transformer is started. -----Original Message----- From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Jim Brain Sent: Thursday, September 12, 2013 11:34 PM To: firstname.lastname@example.org Subject: 9VAC from 5VDC? Does anyone have ideas (or could point to a person or company) that might have a way to safely synthesize an isolated 9VAC for the machines from 5VDC? From documents like this: http://www.ide64.org/power_des.pdf a simple voltage doubler and timer won't completely work. Would putting a 1:1 transformer on the end of the 9V output isolate it? I was thinking if the isolation issue was handled, creating a more pleasing sine wave would be the lesser concern. (maybe a small uC with a R2R DAC tied to some power transistors, etc.) Jim -- Jim Brain email@example.com www.jbrain.com Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2013-09-13 19:00:10
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