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The best way is using a DPDT-relay rated properly.
Boncuk
Yes, you need to switch both of them. How are you turning off the positive supply?I am running out of PCB space , I forgot to mention the load is quite low 200mA max . Is disconnection of -15V altogether mandatory ?
-Adi
Yes, you need to switch both of them. How are you turning off the positive supply?
Q2 has to be driven by a signal referenced to -15V.dark - something like this -
I replaced the 3904 with a 2n2222 and the 3906 with a 2n2907 to increase the current capability from 200 to 600ma.
Yes, like I mentioned in an earlier post, it will turn on at -13.6v. The could be an advantage or disadvantage depending on the rest of the circuit. You could change Q2 to a 2n3906 and flip that part of the circuit upside-down to get it to work with a ground reference, but then it's inverted and sitting near +15v, so you would add a fourth transistor...
Better to wait and see what dark is driving it with.
Sheesh, its not hard, a minature DPDT relay would solve the problem simply. No leakage and as small as a circuit involving transistors.
Please see my previous thread I did mentioned there.You still haven't told us what you are driving the switch with.
Please see my previous thread I did mentioned there.
-Adi
Is it mentioned in the datasheet regarding the power sequensing threat . Mikebits it would be appretiated if you please help me as to this regards , the chip is (AD 6 9 8).
Thanks
-Adi
I have looked at your threads, where does it say how you are going to control this additional power switching device.
Is it a switch input or a logic input, etc.?