My finished fusebit doctor. If helpful, I used ksp2222-NPN and PN2907A-PNP transistors, and Atmega 328P-PU Doctor chip. For resistor R7 to R23, used 470 ohm. Also used 470 ohm for R25 instead of 100 ohm pull down resistor; stays cool, only dissipates .05 watt instead of.25 watt, and communicates with Attiny 2313.
