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Old 28th May 2003, 04:27 AM   #1
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Default My first real amplifier

First amp I built was a TIP41/TIP42 based that did not use NFB. Not very powerful, had decent sound though. You can find it here

I've torn this one down though for a much better one which I have also designed. This one uses TIP35/TIP36 on the drivers, and two pairs of TIP42/TIP41 as preamp and middle stages. This design does use NFB, sounds much cleaner and is much more powerful. After blasting this amp through a two ohm load for three hours, the heatsink measured only 103 degrees F. I've just wound a toroid transformer because I plan to use it as a subwoofer amp in my car. The part count is fairly low considering its power and is 100% discrete component, no op amps whatsoever. If there is enough interest I will make schematics using MS-Paint and post pictures.
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Old 28th May 2003, 05:29 AM   #2
jleaman is offline jleaman  Belgium
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I have that exact same transister tester as you do in the last photo on the bottem. I love mine. works awsome.
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Old 28th May 2003, 01:36 PM   #3
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Yep, I couldn't live without it, mine is a RadioShack, it's probably sold under different brands.
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Old 28th May 2003, 04:51 PM   #4
palesha is offline palesha  India
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I think many mught be interested in ur schematics including me. This forum is by the fanatics, for the fanatics.
MP
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Old 28th May 2003, 06:20 PM   #5
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Ok, I'm at work now so I'll have to make schematics later tonight, hopefully one of you guys can try building it and tell me what you think. This is what I can tell you from here...

Part count:
6 transistors
2 trimmer pots
4 diodes
2 capacitors
7 resistors

-Closed loop voltage gain is around 300, current gain is much higher
-Absolutely no hum or hiss when idle, even on a breadboard
-It does not require a regulated supply
-It should run on anything from 5-0-5 to 75-0-75
-Bias settings are unaffected by supply voltages so you don't have to keep adjusting them
-It can be played as low as can possibly be heard and still sounds clean so my guess is crossover distortion is low
-Cost of parts excluding heatsink and power supply is less than $10
-It can drive a 2 ohm load at lower voltages with no problem

I will work on getting pics online, schematics will be up shortly after
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Old 28th May 2003, 11:27 PM   #6
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I will be waiting for the schematic too...


Jojo
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Old 29th May 2003, 02:40 PM   #7
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OK, I've made a page for the new amp, you can find the schematics here:

http://astro.temple.edu/~xioti/tipamp/

Sorry if it looks a bit weird, I did it in MS Paint
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Old 29th May 2003, 05:42 PM   #8
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OK, both schematics and pictures are online now, tell me what you guys think or if any of you are willing to build it.
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Old 30th May 2003, 05:21 PM   #9
palesha is offline palesha  India
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Solid snake has designed a different type of circuit. The experts here should give their views/suggestions/modifications so that we can proceed further to build the circuit. I must congratulate solid snake for his effort.
Mahendra Palesha
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Old 30th May 2003, 08:41 PM   #10
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Thankyou, Thankyou much. I must apologize again for the schematic, it's a bit confusing. Suggestions and mods are welcome, especially from someone who has built and listened to it.

The goal here is discrete component, simple, clean, cheap and powerful.
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