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QUASI Amplifier for Beginners
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Old 20th November 2010, 08:28 AM   #231
djk is offline djk
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"for +-75 to 80v any substitute for mje15032/33? "

That's a pretty good part, and it shouldn't be too hard to find.

The NJW 0281/0302 would make a good substitute. The ON Semi price reference is $0.93 vs $0.61 for the MJE 15032/33.

http://www.onsemi.com/pub_link/Collateral/NJW0281-D.PDF
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Old 20th November 2010, 10:50 AM   #232
AndrewT is offline AndrewT  Scotland
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post228 will not be reliable with +-65Vdc.

Most of the transistors are the wrong type or wrong voltage rating.
The maximum voltage I would recommend is +-40Vdc.
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Old 20th November 2010, 12:04 PM   #233
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by djk View Post
I don't think the BD139/140 are rated at high enough voltage to work at 65V, nor are the TIP 41C/42C.
Yes, but with MJEs will work at +/-65V, only I suggest 2N5551 instead BC546.
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Old 20th November 2010, 12:29 PM   #234
AndrewT is offline AndrewT  Scotland
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MJE350 are not the correct type for VAS duty.
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Old 20th November 2010, 01:42 PM   #235
echobase is offline echobase  Malaysia
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Quote:
Originally Posted by djk View Post
I don't think the BD139/140 are rated at high enough voltage to work at 65V, nor are the TIP 41C/42C.
Yap! you're right. it is 40V to be precise. Thanks for correcting.

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Old 20th November 2010, 02:25 PM   #236
djk is offline djk
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"MJE350 are not the correct type for VAS duty. "

Sure, there are better types. Consider that it speeds up to 60Mhz around 20mA (use a heatsink), it may be adequate for this type of amplifier.
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Old 20th November 2010, 02:44 PM   #237
boytaho is offline boytaho  Philippines
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Default driver

what do you think is the suitable driver for this amp on this site???
Crown - The Professional Choice

any suggestions?
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Old 20th November 2010, 03:02 PM   #238
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No T/S parameters that I can see.
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Old 21st November 2010, 07:47 AM   #239
noobie is offline noobie  Philippines
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Default pnp output

Quote:
Originally Posted by apexaudio View Post
Do You want QUASI PNP output stage?
care to share your quasi pnp output.

thanks
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Old 21st November 2010, 12:53 PM   #240
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by noobie View Post
care to share your quasi pnp output.

thanks
You can use same circuit for quasi pnp output, just replace all pnp transistors with npn and all npn replace with pnp, revert diode polarity and use revert +/- rail voltage polarity and you get quasi pnp amp.
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