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More or less a fancy linear voltage regulator that allows taking into account the motor IR and Kv in the selection of 2 external resistor values to get a very stable constant-speed, governor-like behavior.

Except it makes sense in combination with the next bit, which makes AB difficult to datasheet in the stock configuration.

AN Datasheet PDF –

Applications listed in the datasheet include tape decks and CD players. Saturday, October 19, Nitron Technical Observations. Pages Home Chrono Data Archive. Newer Post Older Post Home.


So why was this component used to drive the Nitron pusher motor? As it turns out, “voltage regulator” is a very close guess.

Could there possibly be a need for that tight of speed control of this motor? That is the biggest mystery of them all. One is that the pusher is cycle-controlled with the switch mounted on top of the battery box that follows the stepped edge of the cam disk but there is no active braking.

This is why throwing higher voltage batteries at a stock ‘tron makes the flywheel datasheef higher, but doesn’t change the terrible ROF.

This is probably a Part 1 since this is an ongoing project, but I am working occasionally but steadily on a ‘Tron overhaul for an HvZ player at a nearby campus.

Haven’t checked, not worth the time to investigate the numbers of this application.

Datasheet «AN6651»

A quick Google nails it down what the mystery component is: Along the way I came across 2 odd details about the stock Nitron electrical system. Speculation has included that the device is a voltage regulator or a MOSFET used for solid-state switching of the motor power with the small switches scattered all over the Nitron’s guts for various interlock purposes. At datasheet people are aware you have to remove this PCB to do anything useful.


Posted by torukmakto4 at 7: Could it have something to do with dropout voltage? Peak current handling is 1. Surely if the stock setup demanded a lower ROF than the direct-driven motor would produce and no colder-wound motor was available, datashset could do well enough with a dumb, cheap, string of diodes – or even a generic voltage regulator.

This strange heatsinked 4-pin package hanging off the side of the PCB is the first thing many people notice about the stock motor setup on the ‘Tron pusher.