Llamarama
Member
Hello everyone, I'm trying to make a simple -12v power supply that can supply up to 800mA using only simple components so I don't have to order online as I don't have a credit or debit card.
I found a circuit on Colin Mitchell's site showing how this could be done with a 555, and lower down the page, how to increase current using transistors in a push-pull arrangement. Would I be able to use this to get such a result?
The final regulation will be done by a 7912, will the 555 and transistors put out enough current to drive this reliably, or will I have problems with the transistors saturating?
Many thanks in advance
(Schematics lightly modified from Colin Mitchell's site)
View attachment 64970
I found a circuit on Colin Mitchell's site showing how this could be done with a 555, and lower down the page, how to increase current using transistors in a push-pull arrangement. Would I be able to use this to get such a result?
The final regulation will be done by a 7912, will the 555 and transistors put out enough current to drive this reliably, or will I have problems with the transistors saturating?
Many thanks in advance
(Schematics lightly modified from Colin Mitchell's site)
View attachment 64970
Last edited: