A version of the classic Atmel ISP programmer by Thomas Fischl. This one supports 3.3V and 5V operation on the Programmer and Target and has Schottky ESD protection diodes on the 4 main lines for the ISP. A Low drop out regulator makes 3.3V from the 5V USB supplied voltage. Both 6 and 10 pin headers are supported. Mostly thru hole for easy assembly, the ATMega88 is a 32 pin TQFP and should be easy to solder for most people. The ESD diodes are simple SOT23 devices, BAT54C dual types and easy to solder as well. Fischl’s website is noted on the reverse side for all the firmware and operation guidance.

The top solder mask is wrong as shown on this project (OSH Park made the mistake). The mask was corrected and the board should be OK now. Be aware, though to get the correct top solder mask before you order.

If I can find a way to submit a .pdf of the schematic it will go in here as well but the circuit is a minor change from Fischl’s original which is found at: https://www.fischl.de/usbasp/