The TL866 family of programmer are great but unfortunately cannot program 2532 EPROMs or any device requiring a Vpp of 25V.
This adapter PCB overcomes these problems, the original idea came from a design by Volker Bosch.
The board has an onboard switch mode PSU to generate the 25V Vpp (set by preset RV1), power is 'stolen' from the USB path by feeding it via the board.
A rotary switch selected between the three types of EPROM 2716, 2732 or 2532. A toggle switch allows selection of the programmer native Vpp or the onboard generated Vpp.
When the Programmer is configured to provide a 21V Vpp the board detects the Vpp pulse and switches in its own 25V Vpp pulse.
Although designed for the TL866 it should work with any EPROM programmer that can program 2716/2732 but not 2532.
Schematic
Bill Of Materials
Blank PCB
