TL866CS EPROM programmer - well priced little programmer has a couple of issues: low Vpp voltage and can't program 2732's so I built an adapter to fix this.
I can switch between 2716/2732 and 2532, an onboard switch mode PSU generates the 25V Vpp which is automatically switched in when the TL866 Vpp is active.
The circuit is based on a design by Volker Bosch:
Here's a DIPTRACE schematic of my circuit as built on Veroboard in the photo.
I've now designed an improved version with a PCB, this just has a rotary switch to select between the three EPROM types (2716/2732/2532) rather than the confusing links.
