Cheap 100 to 150 Watt Amp

[Kapibara]

Old PCB
http://europa.spaceports.com/~fishbake/amp/ca100.htm

New PCB
http://www.diyaudiotr.com/islecler/t...rum=e#sonyorum

[sakis]

this amplifier doesnt work ...there is been a lot of noise about it many also including me tryied to modifiy this but it doesnt work

john fisher is avery nice guy also a friend but after all this time he has to remove this post about this cheap 150w amplifier since it doesnt really work ...its extremelly unstable

[Bone]

Sorry Sakis, but I disagree. This amplifier does work, but you wont get 100 watts out of it with those output transistors. I've had it working but only up to about 60 watts. I didn't get any oscillation and built it on veroboard as well as a PCB.

Tony

[sakis]

that you should read my posts about amplifier use or abuse .....

then on the other hand if you sup this with 30+30 vdc drive gendle loads and generally be nice to the amp ...yes this will work .... but with voltage more than 34+34 things getting critical ....also not relly omportand what kind of out you are running cause my version had MJ 11015-16 from on semi but still as rail voltage increase together instability distortion and ocilation increase .....

also there is a very big issue about tip 147 or bdv 66 -67 that can be used ...its not that they have to be matched but actually paired meaning that eventhough say that they are complementary if come from diferent factory may be P or N might have diferent charcteristics between driver and out transistor

any way i wouldnt go for an amp like that

[Kapibara]

You may use the BDW83C and BDW84C instead of TIP142-TIP147.

[sakis]

have more or less the same problems ....they have to be the same make the same small numbers ...from the same mama.....

but still this is not going to make a stable amp whats your rail voltage ????

look at mine ...so nice work but prooved to be not stable ( but i also used quiet high rail voltage.....)

[djk]

That amp is a disaster waiting to happen, its been discussed here before.

The good news is after it blows up in your face, you still have the most expensive parts to re-cycle for a real amplifier (power supply , chassis, and heatsink).

Buy a pair of Pass A40 boards for $6 each from AudioXpress.com and build a class AB version of it.

I've used that board (with suitable transistors) at up to 600W/4R on ±95V.

[gaetan8888]

Hello

Here's a thread where they talk about that amp and give some modification do do.

A 100-150 watt power amp using TIP41-142-147 transistors, how about

Gaetan

[Kapibara]

http://img236.imageshack.us/img236/8...amfipcbed7.jpg

http://img236.imageshack.us/img236/6002/img10dz3.jpg

http://img252.imageshack.us/img252/5237/semajv6.jpg

http://img140.imageshack.us/img140/6...erlesimyl7.jpg

http://img78.imageshack.us/img78/368/yerlesimne4.jpg

[Original Burnedfingers]

No self respecting audiophile would build this piece of crap.