reducing voltage
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 18th February 2012, 02:33 PM #1 reins   diyAudio Member   Join Date: Mar 2004 Location: Bayern reducing voltage Hi, I would like to reuse a broken amp as 1 Channel as E-Bass amp. I plan to built the pre-amp also in the housing. Now my question: I have a regulated voltage of +-21V. Op-amps work only with max. 18V. Is there an easy way to reduce the voltage by 3V? Would a Zener work? Thanx Stephan
 18th February 2012, 02:54 PM #2 pdul   diyAudio Member   Join Date: Jan 2009 Location: Copenhagen LM317 Current Calculator - Electric Circuit Try to look at this link.
 18th February 2012, 03:10 PM #3 rcbuck   diyAudio Member   Join Date: Feb 2010 Location: Phoenix, AZ I would use a 78L15 and a 79L15. That should be sufficient to run the op-amps. If you need +/- 18V you will have to use the LM317 series as already suggested.
 18th February 2012, 03:19 PM #4 RJM1   diyAudio Member   Join Date: Jan 2010 Location: Titusville, Fl. There are a lot or op amps that work up to +-22V. LME49860, MC34072, LT1078MH, MC33171DG For example.
 18th February 2012, 03:20 PM #5 reins   diyAudio Member   Join Date: Mar 2004 Location: Bayern I hoped fpr a somehow simpler solution ;-) But it's ok then. Stephan
 18th February 2012, 03:46 PM #6 boyofwax   diyAudio Member     Join Date: Feb 2004 Location: Arnhem Netherlands The easiest way is to put 5 diodes is series with the supply. If you have a symetrical ps you put 5 on the + and 5 on the -. Pls observe polarity. Use silicium diodes only as they have a drop of 0.6V each (0.6V x 5 = 3V). 1N4xxx series will do and are common. This is the most simple, though I'd prefer the 78xx and 79xx series. They are also available in 18V version.
 28th February 2012, 02:56 AM #7 FRANK BRAUN   diyAudio Member   Join Date: Jan 2006 Location: makati try using LM 7818 from NS (max. out current == 1 amp.) if you used LM 317, 1.5 amp max.

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