can you please describe the sound with the tracks that you have been listening on these. Just a small paragraph would be fine.
Early build pics, have tidied up quite a bit since and changed most resistors.
Fantastic and stable amplifier, thanks to Valery and Jeff.
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I see on schematic Q9, Q10, mje350, 340.
Why we don't use 3503,1381here?
We need slow transistors here for stability?
Why we don't use 3503,1381here?
We need slow transistors here for stability?
Details of the heatsink.
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Beautiful build man! Great job
I've got the same soft-start / protection system in my prototype (evolution of "21-st century" board).
Exactly, they are more suitable in terms of their temperature characteristic - just based on a practical test.
Is it something to do with case still, is the f version also suitable?
I mean the insulator version.
KSE340
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Hi Hugh, thank you for your kind feedback - means a lot to me.
Good to see some excellent builds here - Simpelstark seems to be a rather repeatable design. A few builders had an issue with IPS DC behavior, however, in the coarse of troubleshooting we came to conclusion the jFETs were faulty - after replacing them the amplifier started up nicely. No danger for the outputs was observed though, which is always a pleasure 🙂
Cheers,
Valery
I'm actually not sure about the reason. Maybe in this design the difference will not be noticeable. I experimented with bias spreaders working on NS OPS - there are 2 spreaders there, aimed to work pretty much in sync - mje340/350 showed the best results at that time. Later on I just used them without thinking too much 🙂 By the way, in my build I used the ones with fully plastic package (no metal pad), so I screwed them to the heatsink with no insulation pad.
Yes very close but i ended up from TO247 insolation pads and 8dil i.c sockets. 😡
I think that i can't do this before the end of the next week.
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In the meantime I would like to ask some questions. Is it necessary to use all three relays in the protection circuit?
Mouser have 0 available.NTC isn't available too. What will be as alternative?
The same for small transformer.
Mouser have 0 available.NTC isn't available too. What will be as alternative?
The same for small transformer.
What board are you using? If it's the dual supply version there should be four relays. https://www.mouser.ca/ProductDetail...s/JTV1AS-PA-12V?qs=umv0XtuMgE%2BziFnITFaOfA== should work.
They have the NTC resistors in stock. https://www.mouser.ca/ProductDetail...%2BmDunE66Xse2Neqn/VBK0D/PfcdzanUxnmoWDnjww==
The transformer is available from a few different manufacturers. https://www.mouser.ca/ProductDetail...ha2pyFaduiK845wCHSMkRzd9Qbl9ih97%2B3P5qNO2sM= https://www.mouser.ca/ProductDetail.../f%2B/sEj98vQNOG7QxCQqDsPQgCB8hSbfwBtMyqvvg== https://www.mouser.ca/ProductDetail/Hammond-Manufacturing/183G24?qs=%2Bn8HNu1qIocIooNo9pVR3A==
They have the NTC resistors in stock. https://www.mouser.ca/ProductDetail...%2BmDunE66Xse2Neqn/VBK0D/PfcdzanUxnmoWDnjww==
The transformer is available from a few different manufacturers. https://www.mouser.ca/ProductDetail...ha2pyFaduiK845wCHSMkRzd9Qbl9ih97%2B3P5qNO2sM= https://www.mouser.ca/ProductDetail.../f%2B/sEj98vQNOG7QxCQqDsPQgCB8hSbfwBtMyqvvg== https://www.mouser.ca/ProductDetail/Hammond-Manufacturing/183G24?qs=%2Bn8HNu1qIocIooNo9pVR3A==
Thanks Jeff, this is what i have.
Yes 4 relays, but why?
Assuming first relay is the on-off, second the inrush.
Isn't these enough for the Silberstack?
We haven't valves or something here.
Yes 4 relays, but why?
Assuming first relay is the on-off, second the inrush.
Isn't these enough for the Silberstack?
We haven't valves or something here.
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This board is designed to power dual power supply transformers for dual-monoblock builds. It soft-starts and powers each supply transformer separately and sequentially (less light dimming with big supplies). If you are just using one transformer in your build you can just populate one set of relays.