Advice needed on a component swap

Started by Guitarist335, November 15, 2022, 10:39:45 PM

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Guitarist335

Hi folks:

I am interested in building a Punch Amp that I found on this site. More specifically, it is the one found here. https://www.diystompboxes.com/smfforum/index.php?topic=99271.60

It is the one posted by chptunes, entitled Re: PUNCH - 1W amplifier. On his post, it has a picture of their build omn a perf board, followed by the schematic.  Here are the questions I need help with:

1.  The schematic calls for a 2N5457 transistor. I don't have one of those, but I have a slew of transistors including:
BC327, BC337 BC517, BC547, BC548, BC549, BC550, BC556, BC557, BC558, S8050,S8550,S9012,S9013,S9014,@N3904, 2N3906, C1815, A1015, 13001. 

I also have a 2N22222A-2, which I understand is fairly generic.

I am wondering if I can use any of the above transistors, in place of the 2N5457 transistor that the schematic calls for?

2. The schematic also calls for a TDA7052A Op Amp. I don't have one of those, but I have TL072, TL082, TL081, 4558D and 741.

I am wondering if I can use any of the above Op Amps, in place of the TDA7052A Op Amp that the schematic calls for?

As you can probably guess, I'm a novice in this and your appreciate your advice and expertise.

Thank-you







idy

The 2n5457 is a JFET. I think all the ones you have are BJT. Different animals.

The TDA7052 isn't an opamp, although the symbol on the schematic looks like one, it is a an audio power amp chip designed to deliver power to a speaker. Opamps not so much.

Guitarist335

Idy: Thank-you for the clarification. Back to the drawing board. Does anyone know ion a simple Punch Amp schematic that utilizes the parts that I listed above?

antonis

You might utilize a couple of BJTs (or an op-amp) for input buffer, any op-amp for signal amplification (in case of TLXX you may omit input buffer) and several BC337/327 and/or 2N3904/3906 in parallel for output power stage..
(and a couple of BJTs wired as diodes, in case of diodes lack..)
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..