UNI-T UT61E Auto Power Off

This is a near-direct copy of Mr. Herbert's mod that can be found here. On the meter side, it's just a little pcb (.45x.25 in) that can be adhered to the meter's board instead of gluing the phototransistor to the back case's window and running wires across free space.

The boards are from OSHPark and came in just over two weeks. I tested size 24 font and it came out great, very crisp and really small.



 


Tiny print.

Ready for testing.

The action continues ... in Part 2.

BOM

1x of LiteOn LTR-4206E phototransistor ... 3mm ... Digi-Key 160-1030-ND.
1x of 100k ohm resistor ... 0805 ... Digi-Key 311-100KCRCT-ND.

To-Do's

1. mod serial cable
2. test circuit
3. make official BOM
4. order 100k resistors
5. fab