tm wrote:


As a general rule, MOSFETs are not used for linear current control. It is
more looking like this is a switcher (PWM) though I dont see an inductor.
Could be they just use the motor for that.

It's not a switcher. And those transistors may not be MOSFETs. But there
is no reason not to use mosfets in linear mode, other than the fact that
no two off the line have the same gain or transconductance.

If you can see any numbers on the devices, it will help. Also, the solder
sure looks like RoHS **** tin.

Agreed.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."