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Old 11th January 2013, 03:56 AM   #21
6L6 is online now 6L6  United States
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That seems logical - we are fearless amplifier builders, after all.

Can probably make the input cap smaller as well.
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Old 11th January 2013, 04:03 AM   #22
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hehe yes. we can not enjoy success before we have failed to achive it
ooh. that was a little to deep

Last edited by AudioSan; 11th January 2013 at 04:06 AM.
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Old 11th January 2013, 07:12 AM   #23
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It never ceases to amaze me that there are individuals/companies that think they are the only ones in the world authorized to make money, so that they feel it's unnecessary to pay for things like services/design work. One of the pitfalls of a consulting job....
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Old 11th January 2013, 08:12 AM   #24
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Quote:
Originally Posted by bobodioulasso View Post
Input ground: C8- R2- R35 node?
Or rather R8-R35 node?
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Old 11th January 2013, 09:41 AM   #25
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well .. i am rather sad looking at a schematic like that ....World wide demand of TIP 142-147 will raise like hell again ..

I also find it very sad that in many of TIP 142-147 specs there is no audio specs which is rather expected since TIP 142-147 is low freq switching application or better elevator transistor to drive the solenoid that locks the door

I also find very strange that internals of a TIP 142-147 vary from manufacturer to manufacturer and often from batch to another with the relation between the driver and the output undefined or unknown which will result that the specific transistor will behave in a different way when it comes to beta and thermals ....

Yet again in my trivial about darlingtons i said very clearly that i have never seen an amplifier that uses parallel darlingtons except the NP A40 which to my gestimation it doesn't fall in oscillation since darlingtons are way too busy with the bias .

Thermals should be some issue in your design i think and implementation by DIYers will bring up issues ..

One more thing will be that when it comes to design something it will be wrong to work on semis that already have been cannibalized by plenty of bad /second/third manufacturers ...When people like me that repair 400-500 amps per year often need to find any possible transistor existing to maintain specs ...Ask me where you can get real TIP 142-147 and the answer will be i don't know !!!

I fall from the clouds ..... i was really expecting a lot more in this field from the one and only ....

Kind regards
sakis
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Last edited by east electronics; 11th January 2013 at 09:48 AM.
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Old 11th January 2013, 09:51 AM   #26
Zen Mod is offline Zen Mod  Serbia
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if you were expecting - just made half of any of X amps

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Old 11th January 2013, 10:31 AM   #27
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Ok zen !!! Got it ....thanks
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Old 11th January 2013, 09:26 PM   #28
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hi,

I just did AB100 simulation in LT SPICE (with MPSA instead ZTX and BD instead SC/SA), feedback resistor increased to 20K = input 1V; output 16V . DC offset low, THD about 0.01%. 50V rails.
looks good to me (I am not an expert in spice)
tnx NP. maybe someone stronger in Eagle or other software can draw some layout >?
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Old 11th January 2013, 09:40 PM   #29
osscar is offline osscar  Latvia
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its works fine even with 24V rails and you can bias it for 1A and adjust gain.
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Old 11th January 2013, 11:56 PM   #30
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A big thank you Nelson for this gift

This amp looks reliable and quite CHEAP to build ))
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