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There are 4 screw terminals on the board:
- IN - the audio signal input from the secondary of the transformer
- COM - the common connection point between the two transformers - a "Ground" reference for the high Voltage bias
- HV - the High Voltage output
- ACC - an accessory connection which goes nowhere. I use it for the other secondary.
The wiring diagram for connecting this into your ESL is:
Please note that I don't include the primary wiring on this diagram. There are many sources for this, including HERE.
Here is a photo of a prior version of this board installed in the electrical panel of my Full Range ESLs:
If you are interested in purchasing these boards, either the bare board or a completed unit, send me an email. The bare boards are $10 each with completed and tested boards at $45 each. The completed boards are built to your voltage specifications.