Vermes
Advanced Member level 4
It is an extremely useful device for everyone who face problems with screwing small pieces.
Elements used:
- transformers from PAR 36
- housings
- fans
- connectors for the screwdriver
- transformers
- heat sinks
- 15A/100V bridges
Housings wer drilled, painted boards were digested and elements soldered. Bridge and capacitor are at the output.
How it works:
Idly engines (no load) get a bit more than the nominal 3,6V (approximately 5,5V – the bridge, filtration). After applying load, voltage drops to nominal and the screwdrivers maintain a sufficiency large torque.
Screwdrivers remained unchanged, except new cella and charging socket). Engines are connected directly to the cable, which has a sufficiently large cross-section, so maximum current (approximately 4A) can flow through it.
Fans are necessary as in sealed housing it could be too hot. Even with a heat sink, after several minutes of operation, the bridge heats up significantly.
Link to original thread (useful attachment) – Recykling, czyli wkrętak na smyczy - zasilacz i mała przeróbka.