I posted an example of how to do a 5VDC/9VAC convertor using the first transformer I found on Digikey that matched thebasic specs , there are probably all kinds that would work. The design is two single-ended to ground drivers which I show as TIP120 just for current and gain without worring about the parameters. Transformer can be a Single Primary 110V to 48 VAC Centertap secondary or I showed a dual primary with the 110V primaries wired in series and 24 VAC Centertap. I have not tested the design or done the real exact 2nd level of math, this is an example of how I have done this in the past. http://c128.com/sample-5vdc-9vac-convertor Bil -----Original Message----- From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of email@example.com Sent: Sunday, September 15, 2013 5:59 PM To: firstname.lastname@example.org Subject: Re: 9VAC from 5VDC? On 2013-09-15, at 07:49, Jim Brain wrote: >> I believe they used 24VAC for landscape irrigation valves and outdoor >> lighting. > Ah yes, they do. >> >> A switcher would be smaller/cheaper. > I agree switchers are smaller and cheaper, but I don't see anyone selling a switcher that does 9VAC. I've asked... on two continents. True - SX-64 is no longer being produced ;-) But - BTW - it might be good to check what transformers (they were pretty small) CBM used in the SX PSUs. Maybe those (or similar) are still available. -- SD! Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2013-09-15 23:00:07
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