AN6652 Matsushita
DC Motor Circuit Investigation,
but No Modification.
DC Motor Circuit Investigation,
but No Modification.
I have another identical Matsushita motor where I decided to examine the motor controller circuit - this time based on the (later?) AN6652.
Before I took the back off, I had to de-solder a tag which connected the metal casing to the ground point. The casing is now electrically neutral to both ground (or -ve) and +Vcc. If in doubt, I would suggest we do this before attaching a similar motor to any cassette deck.
The circuit above is essentially the same as in the previous AN6651 configuration, except for: a signal diode, C=22uF, and here R1, R2, and R3 all effectively form part of Rs.
Rs = R3+R1||R2 (R2 effective).
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