mike50
New Member
Those measurements don't make much sense.johnl69 said:Q1, D=0.00, G=7.40, S=0.00
Q2, D=0.00. G=0.00, S=0.00
Q3, D=0.00, G=8.50, S=0.00
This is when connected to a 9v battery (pp3)
According to the schematic, the drain of Q1 is connected directly to the gate of Q3. But you show Q1 drain at zero volts and Q3 gate at 8.5 volts.
Something isn't right there.
And, if SW3 is closed, it is hard to see how the gate of Q1 could be at 7.4 volts. SW3 should connect it directly to ground. Are you sure SW3 is closed?
Likewise, it is hard to see how the gate of Q2 could be at zero volts if SW2 is open. Are you sure SW2 is open?
Mike