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Old 9th June 2006, 01:22 AM   #1
j9184p is offline j9184p  United States
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Default Tip102/tip107

I am looking to design an amp to use to drive a powered subwoofer for my home audio system. I am looking to use TIP102/TIP107 darlington pair transistors. They are NPN/PNP. This is the first time I will be designing an amp so any help with design is greatly appreciated.
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Old 9th June 2006, 02:35 AM   #2
CBS240 is offline CBS240  United States
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Hi j9184p,

Welcome to DIYaudio!

Any thoughts on power and complexity willing to be undertaken? Specific topology?


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Old 9th June 2006, 01:37 PM   #3
j9184p is offline j9184p  United States
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I am looking for about 100W RMS. I want to build an amp to use along with a sub for a powered subwoofer for my home theater system. I got the idea for using these D-transistors by looking at a Soundstream amp schematic. They are using 18 of em per channel for 800W RMS with +/-39.6 for the rails. I am new at designing but I spent the past three years fixing all types of electronics.

What do you mean by topology?
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Old 9th June 2006, 02:09 PM   #4
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No offence but you clearly have a hell of a lot to learn. I would suggest you start off building a kit with good documentation, and then settle yourself down for a lot of reading.

If you want 100W RMS you will need 2 pairs of those devices per channel.

The TIP devices aren't too bad but there are better ones out there. I like Darlingtons for their ease of use and am using TIP142 and TIP147 in a design at the moment.
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Old 9th June 2006, 03:56 PM   #5
j9184p is offline j9184p  United States
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I'll admit that there is a lot I need to learn. I have done reading on the subject of designing circuits. I got a few electronic books on the subject of engineering that I read constantly. I also have reverse engineered RF circuits and drawn up schematics due to lack of tech data. I don't have much experience with audio amps and when it comes to design, I just don't know where to start.
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Old 9th June 2006, 04:22 PM   #6
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I suggest you start here http://sound.au.com
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Old 10th June 2006, 01:38 AM   #7
Leolabs is offline Leolabs  Malaysia
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Hi j9184p,you can go for TIP142/147 too.Audio Analogue did use them.
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Old 10th June 2006, 04:24 PM   #8
j9184p is offline j9184p  United States
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Thanks for the tip. I think i'll use those. What Q current should I use? Also should I use 500 or 1000 for the hfe?
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Old 11th June 2006, 09:31 AM   #9
djk is offline djk
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The TIP 102/107 pair are woefully inadequate for more than about 40W, the TIP 142/147 can do about 60W.

You want 100W out of a single pair of darlington devices you may want to use:

Mouser

2N6284 TRANS DARL NPN 20A 100V 160W TO3 $3.84
2N6287 TRANS DARL PNP 20A 100V 160W TO3 $3.88

second choice:

Digi-Key

MJ11015 TRANS DARL PNP 30A 120V 200W TO3 $3.65
MJ11016 TRANS DARL NPN 30A 120V 200W TO3 $3.65 (non stock)
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Old 11th June 2006, 11:30 AM   #10
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On Semiconductor has a plastic version of the 2N6283 darlington series that may be worth a try. The old metal case devices may be hard to get these days.
I did some simulation in PSpice of amplifiers using the TIP142/147 output devices with MPSW06 and W56 in all other positions. Properly biased, I got about 0.02% THD with a single ended differential front end, and about 0.01% THD with a complementary differential front end. Harmonic distribution was not too bad, though I get better results with pure Class A designs (is anyone surprised? - I thought not...). As always, the simulations are for indicating general trends/shortening bench time, not a be-all and end-all. After all, you can't listen to a simulation. I started with a circuit out of the old Motorola power darlinton app note from circa 1973 using an extra driver stage with the emitters hooked together with a resistor. Simulated performance for the single ended differential amp was not too shabby with a 100ma output quiescent current, though the amp needed lag compensation to quell oscillation, just like in the app note... I will post some circuits if folks are interested.
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