simple transistor curve tracer by W2AEW

my first delve with a (npn) transistor curve tracer.

im using a genuine TI LMC555 & TLV2472AI(R2R) op-amp. free samples from way faar away years ago. power supply is around 5.5Vdc. npn is 2N3904(fleabay) and pnp 2N2907, also flea.

DUT is 2N2222 (flea)

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