pete g
Member level 1
hi all, just finished making above programmer. firstly, can a 2n7000 replace a bs170? tyhe programmer passes vdd test ---but fails the vpp test. voltage level issue. checked all the usual suspects, semi orientation, shorts, opens, componet values. cannot find problem. scoped pins of 18f2550, found osc signal on pins 9 & 10. a square wave on pin 13. these reading were taken with no pic in the programmer. vdd measured 5 volts.