Not a modern one. See attached pics. It's really not broken but I had to adjust the trimpot to get 120v output with a 120v input, it was switching down to 110v. Perhaps due to aging components. I can find no direct info on the unit as a whole or the transformer itself.
I've checked the transformer voltages in operation and out of circuit with ohmmeter and determined there is a center-tapped primary and a secondary with four voltage taps in ten volt increments; 110v, 120v, 130v, 140v. In the transformer itself there is no continuity between primary and secondary windings but in circuit the input and output of the device share ac neutral. It has three relays, noise filters and a trimpot adjusting somehow I assume to be a power transistor(s) kicking the relays. I can only see one transistor from the sides.
I am curious how this particular unit is designed, to the point of wanting to take it apart to find out. There are a couple of small electrolytic cans on the board I want to check anyway, it's old gear from the 90s.
I've checked the transformer voltages in operation and out of circuit with ohmmeter and determined there is a center-tapped primary and a secondary with four voltage taps in ten volt increments; 110v, 120v, 130v, 140v. In the transformer itself there is no continuity between primary and secondary windings but in circuit the input and output of the device share ac neutral. It has three relays, noise filters and a trimpot adjusting somehow I assume to be a power transistor(s) kicking the relays. I can only see one transistor from the sides.
I am curious how this particular unit is designed, to the point of wanting to take it apart to find out. There are a couple of small electrolytic cans on the board I want to check anyway, it's old gear from the 90s.
Attached Files
