20watt amplifier
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Solid State Talk all about solid state amplification.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 20th August 2011, 06:55 PM #1 shreya   diyAudio Member   Join Date: Aug 2010 Location: Andhra Pradesh 20watt amplifier Could somebody provide a 20watt amplifier that works with 12v (Only transistor based not chip)
 20th August 2011, 08:04 PM #2 Bigun   diyAudio Member     Join Date: Jan 2009 Location: Waterloo, ON or Herefordshire UK power into a speaker is usually quoted rms and is calculated from P(rms) = (voltage * voltage) / (speaker impedance * 2) So, if you have 12V and I assume that means +/- 6V peak to peak, less say 1V for drop across a power device (optimistic) then you have +/- 5V. To get 20W rms you need a load impedance of less than 1 Ohm. Seems like a tough call with most speakers - looks like you will need to increase the voltage. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
 20th August 2011, 09:02 PM #3 tinitus   diyAudio Moderator R.I.P.   Join Date: Nov 2005 Jean Hiraga's Monster is 8watt, on 12V you could use one of those car switch mode converts 12V into higher voltage 41hz sells classD kits for 12V
 20th August 2011, 09:32 PM #4 john_ellis   diyAudio Member   Join Date: Sep 2006 Two ways to do this, assuming you want to use standard 8 ohm speakers. 1. Use an old-fashioned transformer output stage. You will almost certainly need to wind a suitable transformer but the core size would be around 29 (EI100) or bigger depending on the frequency response you wanted There are some companies that might wind the transformer(s) for you but they won't be cheap. 2. Use an inverter I've built two ferrite-core based inverters one using a saturating core (eugh!) and one using a low power saturating core driving a bigger non-sat transformer (better) - these aren't as flashy as a MOSFET inverter but they are simple (sort of) and fairly foolproof. Both produced +/- 35V from 12 V but you maybe only need +/-25V. Both have worked reliably for several years. Both need filter chokes in the audio leads, so though it is in principle simple there are four coils to wind!. John

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         Dx Classic Amplifiers         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post novtango Pass Labs 4 14th February 2018 05:11 PM mondogenerator Instruments and Amps 4 21st December 2009 07:11 PM ben62670 Solid State 4 26th June 2007 05:29 AM Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM grabo454 Tubes / Valves 13 8th April 2004 07:46 AM

 New To Site? Need Help?

All times are GMT. The time now is 07:08 PM.