coffeecalmsmedown

joined 10 months ago
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1 Watt Amp (updated) in c/diy@hi-fi.community
[–] coffeecalmsmedown@alien.top 1 points 10 months ago (1 children)

Actually, I changed the entire right side, minus the fact it's quasi-complementary. I also added a Zobel network, NFB, and another voltage gain stage. But ok, thank you for letting me know. I don't want to do an AB output for this project 🤷🏻

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1 Watt Amp (updated) (alien.top)
 

Thank you all so much for your help yesterday. I've made a number of design adjustments, and it definitely looks more manageable (at least to me).

I'm hoping to get approx 1 Watt at 8 Ohms out, using a 12v supply. The design is based off of a number of other amps, including the Leak 30, El Cheapo, Z30/50, etc. As I made a few adjustments yesterday, I also realized the topology is becoming closer to a 60s Fender Princeton, though using BJTs.

Stage 1: peaking current/gm-compensated Stage 2: buffer (emitter follower) Stage 3: quasi-complementary output, driven by a unity gain phase splitter

1 Watt Practice Amp in c/diy@hi-fi.community
[–] coffeecalmsmedown@alien.top 1 points 10 months ago

Hey thanks, I'm going to work on it a bit more today and post the whole circuit, input stage and edits included.

I'm kind of stuck on quasi-complementary output for now, though maybe an AB amp would be a good design for afterwards. The Leak 30 Stereo, Mullard 5-10(tube), El Cheapo, Armstrong 600, and the Sinclair Z50 all used quasi-complementary output, and I'd really like to try to get a less-modern sound, if that makes sense. More to come!

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1 Watt Practice Amp (alien.top)
 

Hey folks! I'm trying to design a 1 watt guitar amp with quasi-complementary output, using a 12v supply. The quick sketch below is partly inspired by the Leak 30, as well as a book by Teemu Kyttälä on solid state amps, and some other reading. Not shown is the gm-compensated mirror on the preamp side.

My questions are as follows:

  • do you think 12v is adequate for this circuit?
  • is there anything that's just plain wrong here? Yes, it looks crude/simple, though I'm mostly asking whether I'm going to fry something.
  • would it be worth my while adding a Zobel network at the output? I don't mind some dampening if the ends are justified.

This is a small guitar amp I want to use in my apartment; No more than a single watt is required. And I'm looking for an American-style sound with good distortion at the higher end.

Thanks in advance :)

9v Headphone Amp Circuit in c/diy@hi-fi.community
[–] coffeecalmsmedown@alien.top 1 points 10 months ago

I'm assuming due to its simplicity?

9v Headphone Amp Circuit in c/diy@hi-fi.community
[–] coffeecalmsmedown@alien.top 1 points 10 months ago

Goal is 120-150mA, 1v out for 8 ohms

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9v Headphone Amp Circuit (alien.top)
 

Hey folks, I'm really new to this and realizing the more study the more am out of my league here. This is definitely not what went to school for 😅

I'm hoping to get 120-150mW out using this little circuit and 6*AA batteries. Do you think this is possible? Would you change/fix anything?

Any/all help is appreciated 😊