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Old 8th December 2011, 04:42 PM   #21
amptech is offline amptech  Scotland
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Quote:
Originally Posted by anders3408 View Post
moscheft: what is wrong with Q14 ? :S

the low ohm is because i have an sub with two 4 ohms subs, and these are in parallel and i need to disamble the sub if it shall goes in 4 ohms. how many output devices is need for 1 ohm ? i had made one of these class ab amp before with +-40 volt rail and smaller output deviceses and i also just gave 65 watt whit low thd. but now i will try a bigger one. and because i have a serios transformer laying with many bigs caps and biig diode rectifier. i was building an class t amp , an amp 7 from 41hz.com but it played fm noise with an +-52 test rail, and my first time i mounted the 58+- rail it blows up, but it was because a lm317 was shorted so the 10 volt supply was 28 volt, all fets blows , the tripath ta3020 chip blows up and 5 caps blows up, i dont know if i try it again some time, but for now it is laying in the corner

amtech, what will the caps do diffrence ? are u meaning that i shall add a 47 uf cap or 100 uf between the resistor and ground ?
yes, add a 47uf in front of this 1k resistor to ground
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Old 8th December 2011, 04:51 PM   #22
amptech is offline amptech  Scotland
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Quote:
Originally Posted by moschfet View Post
If you don't see it, but Q14,20,21,22,23 are wrong wired.
The emitter must wired at positive voltage.
I agree, there! npn's ie 2sc5200 pos rail and pnp's to the neg rails
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Old 10th December 2011, 03:09 PM   #23
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i have maked one off these amps berfore, but just with some smaller transistor but with the same principle. and it had worked just fine maby i am designed it wrong this time, i will go true the papers i have for the old amp
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Old 12th December 2011, 06:45 PM   #24
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this is the org schematics from the amp that i had build before, it runs +/- 40 volt and delivers 50 watt.

forstærker.jpg

This is the new schematics, will this look better ? i am planing to drive it in 4 ohms, or ells it shall have 24 output transistores for 1 ohm. i have found some fault in the old ones i have edited.

Forstærker.ms11.pdf
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Old 13th December 2011, 11:53 PM   #25
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is there not anyone that has a comment ?
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Old 14th December 2011, 04:22 AM   #26
amptech is offline amptech  Scotland
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it would be a waste of o/p devices if this amplifier suffered a short circuit...looking in to adding s/c protection to limit drive current. read randy slones high power design book there's plenty of way's to add and improve this design.
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Old 14th December 2011, 01:43 PM   #27
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im also adding a circut that cuts off all power if the heatsink is getting too hot. what do you mean with S/C portection ?
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Old 14th December 2011, 01:44 PM   #28
AndrewT is offline AndrewT  Scotland
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fuses, current limiter, IV limiter, you choose.
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regards Andrew T.
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Old 14th December 2011, 03:37 PM   #29
amptech is offline amptech  Scotland
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I would agree with Andrew, in-relation to the above suggestions... adding a thermal cut is not enough to protect this amplifier with the amount of power transistor's your thinking of adding in to this build, also include speaker relay protection circuit there's plenty of circuit designs or you can buy ready made kits.. These unit's give soft start and switch the load via a relay and will disconnect in case there's large dc on the amp's o/p.
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Old 14th December 2011, 04:53 PM   #30
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off course i will add fuses on the ac and on the dc and on the speaker output, i will also add a core that messure the current and telling it to a arduino board and if the current is to high or the temp goes to high the dc relay cuts and also speaker relay cuts will all the other parts off the amp work ?
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