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Old 21st April 2011, 11:04 PM   #81
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Here we go, I'll try and get a quote on this
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Old 26th April 2011, 03:53 AM   #82
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Ok, order sent for 200 2SA1015-GR & 2SC1815-GR (50/50), and one Dynalo board...
I don't think I'm financially prepared to organize a GB for the boards, so if anyone wants the single sided PCB's PM me.
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Old 27th April 2011, 06:06 AM   #83
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I order the parts needed from digikey, except 2N5089 (or was it 2N5087), was out of stock. Can I use a alternative BC556 and BC546?
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Old 27th April 2011, 09:32 AM   #84
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You can use any small signal BJT with sufficiently high Hfe and low Cob, so BC546C/556C will do the job nicely, but you have to watch pinout (check the datasheet) and adjust pcb layout accordingly.
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Old 1st May 2011, 05:19 AM   #85
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I had a chance to sit down and start populating the board, My first mistake, adding 7.5K +7.5K and some how thinking that was close to 12K. Good thing I order plenty of resistors this order, I'll turn one of the 7.5K's into 4.99K...
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Old 11th May 2011, 05:57 AM   #86
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I got my 200 wonderful transistors yesterday from the post office, sat down today and started to match them... They must be from some very different batches or something since most of the S2A/S2C were consistently off by 40Hfe. Provided I was using my multimeters built in Hfe measurement tool. I only got 9 matches out of the whole thing...

I believe the 2SC1815 averaged out to be 220Hfe and the 2SA1015 averaged out to be 180Hfe... Strange little things aren't they? I'll be doing better matches with a couple transistors I pulled from my stash and this latest batch, but the question begs; anyone need any transistors?
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Old 16th May 2011, 02:42 AM   #87
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It works



Thank you so much for helping me aparatusonitus, I doubt I would have ever gotten this project done without you. I learned a lot, and now that it's all complete... I can say that it was well worth it.

Thank you
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Old 18th May 2011, 06:51 AM   #88
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how does it sound, can you compare it to other HP amps?
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Old 18th May 2011, 10:20 PM   #89
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The only built the dynalo, headbanger, and Mini3. I currently don't own the last two. My ASKA is on a bread board and I don't have the the supply needed to listen to it, and I wouldn't. It's to easy to bridge connections and accidentally cause a massive offset of some kind.

I won't comment on the sound, apart from it sounds much better then my standard headphone out on my computer.
And now I feel the need to sell this amp to finance some other project... I can't get away from DIY!
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