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#11 |
diyAudio Member
Join Date: Feb 2009
Location: Melbourne, Oz
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What are R3-C6 and R4-C5 for?
What are CX1 and CS1 and RS1 for? Perhaps a schematic showing the Tx and secondary windings, and snubber parts, and the pcb and its parts would avoid confusion. |
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#12 |
diyAudio Member
Join Date: Dec 2019
Location: limburg
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A quick sketch of the schematic
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#13 |
diyAudio Member
Join Date: Feb 2009
Location: Melbourne, Oz
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The snubber is usually a C-RC, and is placed across each secondary half-winding, as it is the energy in each half-winding leakage inductance that needs to be constrained.
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#14 |
diyAudio Member
Join Date: Dec 2019
Location: limburg
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My fault, the first resistor on the left should be a capacitor.
![]() In the pcb schematic it is a capacitor ![]() I can try to put a snubber circuit on each half winding. don't know it's gonna fit, but i can try. I read in different forums that it's no problem to put one snubber circuit over the outer taps, that's why i draw just one. ![]() |
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#15 |
diyAudio Member
Join Date: Mar 2010
Location: Okanagan Valley
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Check the power dissipated by the current limiting resistors for the LEDs. Don't want to let the smoke out.
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#16 |
diyAudio Member
Join Date: Dec 2019
Location: limburg
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It will indeed make it a smokemachine
![]() The led is rated 20mA 3.2V. 4k7 with 50v will result in 10mA trough the led and near 0.5w in the resistor. I better pick a 0.5w or 1w resistor. Thnx ![]() |
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#17 | |
diyAudio Member
Join Date: Feb 2009
Location: Melbourne, Oz
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Most new LEDs will happily operate at 2-5mA - perhaps worth checking LED intensity before settling on a resistor dropper value. Perhaps aim for resistor dissipation of no more than 40-50% of rating to avoid brown marks appearing on pcb over the years.
Quote:
Unless you are very dedicated and have tools available, you won't know if your transformer has a significant level of leakage inductance, or if your power supply configuration is pushing a high level of peak rectifier current and turn-off dI/dt, or if your implementation is leaking rectification noise in to the audio path, and it would have to be a severe case for your ears to pick out any difference. |
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#18 |
diyAudio Member
Join Date: Dec 2019
Location: limburg
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Thnx for the info,i will try different resistor value's for the led. Maybe 10k, if it's emits light is good enough
![]() The snubber circuit will be on each half winding, it fits on the pcb. I will try the quasimodo circuit on the transformer later ![]() Next week i'm gonna mill the pcb, all parts are arrived. |
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