When running Shuntky at 42-0-42V AC R21 and R22 are woefully under-rated and fused immediately.
C15, C16 and C2 are Low ESR 1000uF 100V caps by Rubycon.
R23 and R24 are OK at 4R7 0.5W but I had to go to 3R3 at 1W for R21 and R22.
Noactive devices are fitted yet, other than the diodes and zeners, so this is the current drawn simply by charging the caps and powering the zener chain.
C15, C16 and C2 are Low ESR 1000uF 100V caps by Rubycon.
R23 and R24 are OK at 4R7 0.5W but I had to go to 3R3 at 1W for R21 and R22.
Noactive devices are fitted yet, other than the diodes and zeners, so this is the current drawn simply by charging the caps and powering the zener chain.
I must have misunderstood the cookbook. I assumed that 4R7 at 0.6W would be OK.
I'm now successfully using 3R3 at 1W. For safety I'm testing at each stage of the build just in case something expensive goes wrong.
R23 and R24 seem fine at 4R7 and 0.6W it was just the input resistors to the bridge rectifier.
I'm now successfully using 3R3 at 1W. For safety I'm testing at each stage of the build just in case something expensive goes wrong.
R23 and R24 seem fine at 4R7 and 0.6W it was just the input resistors to the bridge rectifier.
Zen Mod.
I've tried evey avenue that I can think of to identify a heatsink that will fit Q1 and Q1A on the Shuntky.
I have not even come close.
Do you have a part number and supplier for the heatsinks that you designed the PCBs for.
The only solutions that I have come with are to (1) remotely locate Q1 and Q1A or to build a heatsink out of alluminium parts (FUGLY).
The bigger heatsink for the SHUNTKY and the PUMPKIN are available from Farnell, who are a Worldwide supplier.
Andy
I've tried evey avenue that I can think of to identify a heatsink that will fit Q1 and Q1A on the Shuntky.
I have not even come close.
Do you have a part number and supplier for the heatsinks that you designed the PCBs for.
The only solutions that I have come with are to (1) remotely locate Q1 and Q1A or to build a heatsink out of alluminium parts (FUGLY).
The bigger heatsink for the SHUNTKY and the PUMPKIN are available from Farnell, who are a Worldwide supplier.
Andy
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http://www.conrad.de/ce/de/CategoryProducts.html?categorycode=0205043&page=0
this one is first I see as good one
Kühlkörper Fischer Elektronik SK 09 50 SA (B x H x T) 29 x 11.5 x 50 mm R(th) 7,2 K/W im Conrad Online Shop
search there , maybe you'll find exact one
in any case - try also at https://www.buerklin.com/default.asp?l=e
this one is first I see as good one
Kühlkörper Fischer Elektronik SK 09 50 SA (B x H x T) 29 x 11.5 x 50 mm R(th) 7,2 K/W im Conrad Online Shop
search there , maybe you'll find exact one
in any case - try also at https://www.buerklin.com/default.asp?l=e
I managed to get them from
https://www.buerklin.com/default.asp?l=e
Part No.
70 B 7206
They worked out about Euro 20.00 to the UK.
https://www.buerklin.com/default.asp?l=e
Part No.
70 B 7206
They worked out about Euro 20.00 to the UK.
I got lost in one German site, I may have inadvertently ordered two sets of 4. If I receive too many I will post them here at cost price. The spare set were slightly longer than those listed above.
I had endless trouble sourcing the correct heatsinks.
Both are available from https://www.buerklin.com/default.asp?l=e
Bigger ones are Part No. 73 B 1792
Smaller ones are Part No. 70 B 7206
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