TL866 Adapter

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.

TL866 ProgrammerTL866 Programmer with AdapterTL866 Programmer Adapter

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:

TL866 Programmer Adapter Schematic

Here's a DIPTRACE schematic of my circuit as built on Veroboard in the photo.

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