5.1 amplifier for me

bitravi · 31st December 2007, 02:31 AM

can anyone help me in building a good 5.1 amplifier with easily available component ,i want to add a remote to the project.If project is on pic then pls help me.
I want to build entire project on transistors not o ics.
i have already made speakers with 3 way active crossovers but could not build a matching amplifier.there are lots of amplifiers on the web but in my local market only 2n3055,2n2955,irf540 & irf9540type transistors are available.I started building elektor hexfet amplifier but it costed me a lot as hexfets are not stable in the circuit.
i need a sweet sounding circuit which can drive the (5)3 way satelite speakers.
subwoofer amplifier is ok ie:200 watt bipolar from sam electronics.

linuxguru · 31st December 2007, 04:03 AM

IMHO, except for the fronts, the remaining satellites can be simple full-range units - 3" full-range drivers are perfectly adequate for the purpose. Even for the fronts, a good full-range like the Pioneer BF20FU20 'Bofu' with a small helper tweeter coupled with a simple passive crossover should be adequate.

Regarding the amp, there are a great variety of inexpensive imported 6-channel amplifiers, both new and pre-owned, that are available on the market today, so there's not much point in DIY for a 6-ch home-theatre amplifier. There's much more value in building a low-distortion, high-end, two-channel stereo with the latest ideas in circuit design and topology - check out the Symasym, RMI-FC100 and various other projects on this forum.

BTW, the 2N3055/MJ2955 pair is highly dated for high-quality audio use - it has an fT of <3 MHz and hfe is not very linear with Ic (it was original designed for high current switching/servo/solenoid control etc., not audio use). For high quality audio applications, try out a recent Toshiba output pair like the 2SA1943/2SC5200 or 2SA1987/2SC5359. Both of these offer excellent gain linearity, fT ~= 30 Mhz, and very good Safe-Operation Area (SOA) - and are fairly inexpensive at around Rs.50 each in Bangalore (there are a lot of fakes, though - always inspect the devices carefully).

31st December 2007, 02:31 AM	#1
bitravi diyAudio Member Join Date: Jul 2007	5.1 amplifier for me can anyone help me in building a good 5.1 amplifier with easily available component ,i want to add a remote to the project.If project is on pic then pls help me. I want to build entire project on transistors not o ics. i have already made speakers with 3 way active crossovers but could not build a matching amplifier.there are lots of amplifiers on the web but in my local market only 2n3055,2n2955,irf540 & irf9540type transistors are available.I started building elektor hexfet amplifier but it costed me a lot as hexfets are not stable in the circuit. i need a sweet sounding circuit which can drive the (5)3 way satelite speakers. subwoofer amplifier is ok ie:200 watt bipolar from sam electronics.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier	Audiophilenoob	Swap Meet	34	16th May 2005 11:58 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier.	novtango	Pass Labs	2	21st October 2002 01:50 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

31st December 2007, 04:03 AM	#2
linuxguru diyAudio Member Join Date: Sep 2007	IMHO, except for the fronts, the remaining satellites can be simple full-range units - 3" full-range drivers are perfectly adequate for the purpose. Even for the fronts, a good full-range like the Pioneer BF20FU20 'Bofu' with a small helper tweeter coupled with a simple passive crossover should be adequate. Regarding the amp, there are a great variety of inexpensive imported 6-channel amplifiers, both new and pre-owned, that are available on the market today, so there's not much point in DIY for a 6-ch home-theatre amplifier. There's much more value in building a low-distortion, high-end, two-channel stereo with the latest ideas in circuit design and topology - check out the Symasym, RMI-FC100 and various other projects on this forum. BTW, the 2N3055/MJ2955 pair is highly dated for high-quality audio use - it has an fT of <3 MHz and hfe is not very linear with Ic (it was original designed for high current switching/servo/solenoid control etc., not audio use). For high quality audio applications, try out a recent Toshiba output pair like the 2SA1943/2SC5200 or 2SA1987/2SC5359. Both of these offer excellent gain linearity, fT ~= 30 Mhz, and very good Safe-Operation Area (SOA) - and are fairly inexpensive at around Rs.50 each in Bangalore (there are a lot of fakes, though - always inspect the devices carefully).

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)