Bigman80
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The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on May 26, 2020 11:42:45 GMT
0.1% 25ppm for the input stage? No, sorry. The caddocks for the PSU |
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Bigman80
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Post by Bigman80 on May 26, 2020 11:46:58 GMT
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Post by sq225917 on May 26, 2020 13:02:01 GMT
Very nice
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on May 26, 2020 13:09:49 GMT
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on May 26, 2020 16:51:08 GMT
0.1% 25ppm for the input stage? Forgot to ask, why 25ppm? |
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Post by sq225917 on May 26, 2020 18:03:37 GMT
Best parts for the job, immune to temp shift in the only location where a few mohms makes a difference.
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on Jun 10, 2020 10:29:12 GMT
Bit more progress  |
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Post by sq225917 on Jun 10, 2020 18:12:30 GMT
You can drill that centre hole out to 6mm while they're out.
I went through a set of transistors today for a build for a US customer. Bought 5 days after the previous batch which 80% of were +/- 10hfe.
This last batch, 3% in the same value range. I've measured and binned off over 600 parts to get the 20 or so I needed to go with the leftovers from the last lot.
Kinell...
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on Jun 10, 2020 18:43:31 GMT
You can drill that centre hole out to 6mm while they're out. I went through a set of transistors today for a build for a US customer. Bought 5 days after the previous batch which 80% of were +/- 10hfe. This last batch, 3% in the same value range. I've measured and binned off over 600 parts to get the 20 or so I needed to go with the leftovers from the last lot. Kinell... I've had the same...its a pain isn't it. I'm thinking of using EI Transformers. Whats say you? |
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on Jun 10, 2020 22:27:54 GMT
You can drill that centre hole out to 6mm while they're out. I went through a set of transistors today for a build for a US customer. Bought 5 days after the previous batch which 80% of were +/- 10hfe. This last batch, 3% in the same value range. I've measured and binned off over 600 parts to get the 20 or so I needed to go with the leftovers from the last lot. Kinell... There were some parts to be omitted from Sylvans PCBs, can you remember what they were? |
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Post by sq225917 on Jun 11, 2020 6:46:34 GMT
On the mainboards? It's the transistor, diode and resistor group between the capacitor rail and the current mirrors for the input stage.
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Bigman80
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The HiFi Bear/Audioaddicts/Bigbottle Owner
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Post by Bigman80 on Jun 11, 2020 7:35:37 GMT
On the mainboards? It's the transistor, diode and resistor group between the capacitor rail and the current mirrors for the input stage. Ta... |
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Post by sq225917 on Jun 11, 2020 12:26:55 GMT
I have no opinion on transformer types, I've never tried multiple types of the same values in the circuit. Just pick what's important, regulation, efficiency, low intertwinding capacitance, stray field, mechanical hum, size and price and buy accordingly.
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Bigman80
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The HiFi Bear/Audioaddicts/Bigbottle Owner
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Post by Bigman80 on Jun 17, 2020 19:54:49 GMT
A bit more in the PCB. 4 Diodes per board. Transformers are here tomorrow, but i forgot the fixing kits!    |
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Post by sq225917 on Jun 17, 2020 20:26:52 GMT
Fix those caddocks to the case, saves on four heatsinks.
Did you use qspeeds?
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,434
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Post by Bigman80 on Jun 17, 2020 21:36:51 GMT
Fix those caddocks to the case, saves on four heatsinks. Did you use qspeeds? I used whatever Alan had. They are very quick and free lol Yea might do, but i do like heatsinks lol What CW do they need? |
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