I have a 12V car battery, and the device I'm implementing requests 3 pins, + and - and positive enable pin and this enable should connect after the + and - is connected so there should be a delay of some time. But because I want to use crocodile clips there is no chance for 3rd pin. So I try to implement a circuit that does the job for the enable pin automatically. Do you have good ideas?
Below is my fast sketch as a suggestion. It has a analog enable output done by RC which is fine.
When + is connected, C2 is fast charged, T2 pulls T1 base low, C1 starts charging.
When + is disconnected T2 no longer conducts, C2 will discharge via R2, R5 and T1 rapidly discharging C1.
Below is my fast sketch as a suggestion. It has a analog enable output done by RC which is fine.
When + is connected, C2 is fast charged, T2 pulls T1 base low, C1 starts charging.
When + is disconnected T2 no longer conducts, C2 will discharge via R2, R5 and T1 rapidly discharging C1.