samy555
Full Member level 4
Hi
I've built a following circuit:
Voltage at node (2) is about 2V. If I disconnect (R3) at node (3) and the circuit is powered ON then the voltage at the top of cap (C1) is gradually increasing from 0 to 2 volt. But if (R3) is reconnected then the voltage at node (3) never increase more than 0.64 V. The problem in that the transistor never saturate, VCE = approximately 10V and a 12V relay connected to the collector will never activate.
I need two things:
FIRST: How can I make the circuit operates a 12V relay?
SECOND: Where to connect a diode to discharge C1 when the circuit is OFF?
Thank you very much.
I've built a following circuit:
Voltage at node (2) is about 2V. If I disconnect (R3) at node (3) and the circuit is powered ON then the voltage at the top of cap (C1) is gradually increasing from 0 to 2 volt. But if (R3) is reconnected then the voltage at node (3) never increase more than 0.64 V. The problem in that the transistor never saturate, VCE = approximately 10V and a 12V relay connected to the collector will never activate.
I need two things:
FIRST: How can I make the circuit operates a 12V relay?
SECOND: Where to connect a diode to discharge C1 when the circuit is OFF?
Thank you very much.