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Old 17th December 2012, 11:42 AM   #11
Mooly is offline Mooly  United Kingdom
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In your first post you say it needs 10 to 14 Vac input. So almost 19 volts is too high. Does that matter ? Its impossible to advise without seeing the circuit details. For example if 25 volts caps are used then 19 volts ac gives almost 27 volts dc after rectification and smoothing. Assuming that was OK and 35 volt caps were fitted then you have the problem of "what else" this unregulated supply feeds and whether or not the dissipation of any PSU components is being exceeded.

On the basis of what we know I would advise not to use this transformer unless you are 100% confident the above points are covered..
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Old 19th December 2012, 03:52 AM   #12
mvorn44 is offline mvorn44  United States
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Circuit is as follows. ac input voltage to KBP206 rectifier to 3300uF 50V cap to 220uF 25v cap & 47 Ohm 5% 3W resistor to 7805 & 7809 voltage regulators.
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Old 19th December 2012, 06:58 AM   #13
Mooly is offline Mooly  United Kingdom
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Without seeing and measuring first hand only you can make the judgement call.

Measure the voltage across the caps with it on. If the 25 volt cap has anything over around 22 or 23 volts across it then its getting close. You have to allow for mains voltage variations.
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Old 5th January 2013, 06:14 PM   #14
mvorn44 is offline mvorn44  United States
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Tested and working fine. Heatsinks are just warm to touch. Just need a enclosure to complete the project. Thanks for all the help.
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Old 5th January 2013, 06:30 PM   #15
Mooly is offline Mooly  United Kingdom
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Thanks for the update... great to hear it all worked out.
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