pyrohaz Posted August 19, 2010 Report Share Posted August 19, 2010 Hey guys! I recently finished my first larger project (in a long time!)As Hero will probably remember, I was considering building a Class D Bass amplifier! Well I have done so and completed it now.Spec:240v Input, Dual laptop supply-age!170w Output (Theoretical)+/- 24v PSUBased around the TDA8920BTH in BTL mode4Ohm 12" speakerLaney Bassman 40 PreamplifierI had intended to convert my Laney Bassman 40 into a much better amplifier because to put it bluntly... It sounded like utter cr*p due to the lame-ass power stage!Luckily with this amplifier, the power amplifier and preamplifier stage were two separate PCB's meaning I could hopefully savage it and use the preamp stage with a new power stage (I diagnosed the problem of which stage sounded so bad by testing the line-out section of the preamplifier on my Marshall Bass 20 amplifier (a lovely amplifier!) and the preamp stage sounded very sweet. So! I ripped out the horrible power stage along with the bulky transformer (this reduced the weight a lot! And prepped the Preamplifier stage for use with my new power supply (the transformer was a 30v-30v non-torroidal one). After testing the preamplifier stage at +/- 24v, I concluded that it worked fine.I bought the power supply and power amplifier board off eBay for a total of: Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 20, 2010 Report Share Posted August 20, 2010 The Philips TDA8920 class-D dual amplifier IC is a good one. Quote Link to comment Share on other sites More sharing options...
pyrohaz Posted August 20, 2010 Author Report Share Posted August 20, 2010 Agreed 100% :) Quote Link to comment Share on other sites More sharing options...
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