So far, I’ve had luck experimenting with a couple of mechanical probes:
- ATL probe: a great familly of mechanical probe. There are even annular ones. Great set of technology: reed switches, inductive pulses, three piezos per head.. and simple motor power supply. Plug in 5V and you’re done.
- Bard: electromagnets. Teardown is quite easy, access to the head more than easy.
- HP: a simple piezo and motor driven relatively easily at 5V.
- Kretz AW14 5B A: first of the series! Can’t remember though how I powered it. Need to thinking.