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Old 5th February 2018, 01:47 PM   #5621
borys is offline borys  Ireland
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Chris
That is well said.
I think I would be able to save money all right. If I count amount of PCB laminate + broken drill bits it may balance the price difference.
THT or melf is the way to go so far.

Regards
Peter
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Old 6th February 2018, 07:41 PM   #5622
borys is offline borys  Ireland
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Found a good ''hole'' for those small crap chip resistors
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Old 7th February 2018, 06:14 AM   #5623
Mrcloc is offline Mrcloc  South Africa
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I've also done SMD prototypes. These amplifiers are fantastic. Good design doesn't need high power resistors. I use 1206's and maximum power throughout the board is no more than 100 mW. Sure, the amplifier is only designed for 35 W, but it can be changed slightly for 100 W (8 ohms), and still power per device won't change much. I only change the 4 SMD power transistors and the output transistors.

Future boards will have the solder mask, and I'll use solder paste, so things will be a lot neater.
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Old 8th February 2018, 07:50 AM   #5624
borys is offline borys  Ireland
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Mrcloc

Nice small little board

What drivers have you used ?

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Old 8th February 2018, 08:28 AM   #5625
Mrcloc is offline Mrcloc  South Africa
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Originally Posted by borys View Post
Mrcloc

Nice small little board

What drivers have you used ?

Regards
Thanks, small was the idea. On this board, I have MJD340 and MJD350. They're identical to MJE340/50 TO126 transistors, and are actually better than people think. The MJE datasheets don't give a lot of information, but the MJD datasheets show they have Ft of 10 MHz.

Anyway, the actual drivers I use are BCP53 and BCP56 (SOT223). The footprint is for DPAK, but SOT223 is a drop-in replacement on that footprint, but fits better. I just lift the middle leg.

Interestingly, I use only 10k and 330E resistors throughout. The only change is a 15E 2512 on the output and then obviously the 0E27 power resistors. Total part count (excluding quantities) is only 16.

Last edited by Mrcloc; 8th February 2018 at 08:32 AM.
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Old 9th February 2018, 06:41 PM   #5626
cheapcuts is offline cheapcuts  Canada
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Default Akai PS200c preamp

Soldering 38 year old wire wraps(60+) on bottem of preamp. Worn selector switch on left of top view.
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Old 10th February 2018, 04:37 PM   #5627
cheapcuts is offline cheapcuts  Canada
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Default Akai PS-200c

Will try to repost in analog line level preamplifiers.
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Old 13th February 2018, 07:47 AM   #5628
fmmech_24 is offline fmmech_24  Austria
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Post your Solid State pics here.
..inspired from Elektor: the BUZ-Amp.
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Old 13th February 2018, 07:57 AM   #5629
Mrcloc is offline Mrcloc  South Africa
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Soldering 38 year old wire wraps(60+) on bottem of preamp. Worn selector switch on left of top view.
That's just a nice bit of electronics to look at. Beautifully neat layout.
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Old 14th February 2018, 08:03 AM   #5630
borys is offline borys  Ireland
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Just received the new boards, couldn't resist to solder a few tiny parts
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