Feeler: Driver Circuit for max LED Power from Hub Dynamo
- Thread starter Martin
- Start date
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The partlists for 3 LEDs + hub dynamo as well as 3 LEDs + bottle dynamo are done. 4 LED hub and 6 LED hub pending.
Here's the current status zipped (Eagle schematic, PCB, BOM, design guide). Some component names have changed vs schematics I have previously published on the forum.
The PCB house will make the first boards this week.
Here's the current status zipped (Eagle schematic, PCB, BOM, design guide). Some component names have changed vs schematics I have previously published on the forum.
The PCB house will make the first boards this week.
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The PCB has arrived:
and been populated:
and fits into the 1 1/8 " steerer tube nicely with some space left:
The PCB has the following issues:
1) Track to anode of SCR burns if the smoothing capacitor is large and the cables are low-impedance.
I will fix the PCB layout.
2) The adjustable resistor touches neighboring components.
Layout fix.
3) The SCR dies when it repeatedly and quickly discharges a large smoothing capacitor.
No fix, as this is not a useful operation mode and fails safe (short). Whoever plans to engage the crowbar frequently, may pick a higher-rated SCR (BOM only) or use long / thin cables to the smoothing capacitor.
4) Solder bridging on the PCB easily happens as it has no solder-resist.
No fix, no issue if soldered with care.
I will correct issues 1 & 2, then order PCBs for CPF members. In a new thread I will ask around how many.
and been populated:
and fits into the 1 1/8 " steerer tube nicely with some space left:
The PCB has the following issues:
1) Track to anode of SCR burns if the smoothing capacitor is large and the cables are low-impedance.
I will fix the PCB layout.
2) The adjustable resistor touches neighboring components.
Layout fix.
3) The SCR dies when it repeatedly and quickly discharges a large smoothing capacitor.
No fix, as this is not a useful operation mode and fails safe (short). Whoever plans to engage the crowbar frequently, may pick a higher-rated SCR (BOM only) or use long / thin cables to the smoothing capacitor.
4) Solder bridging on the PCB easily happens as it has no solder-resist.
No fix, no issue if soldered with care.
I will correct issues 1 & 2, then order PCBs for CPF members. In a new thread I will ask around how many.
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Sorry, don't have plans of selling readily-built PCBs.
I had a few blank ones, but they ran out a long time ago.
The thread you actually want to read is here. It contains links to design files so you can actually order PCBs yourself.
This thread here should R.I.P.
Martin
I had a few blank ones, but they ran out a long time ago.
The thread you actually want to read is here. It contains links to design files so you can actually order PCBs yourself.
This thread here should R.I.P.
Martin
