I’d rather get my -12 off an LM7912 which is what it’s designed for.
Your power supply is central to the operation of your synth and trying to nickel and dime your way past it is not necessarily going to be cheap in the long run. The Frequency Central board costs $12, you can get the parts for few dollars from Tayda, and a suitable wall wart for another $10 or so — which is well above what you seem to be trying to spend, but it’ll work, it’s designed for powering synth modules, and it’s backed up by someone who knows their stuff.
But as I understand LM7912 and LM7812 should have no problem with 19v, so is there need to order 12v power supply?
Yeah, you all guys have a point - power installation is like an insurance, you shouldn’t save all money on it. I will probably go with aisynthesis or Frequency Central Microbus.
The 78xx/79xx regulators are designed for cleaning up an existing voltage relative to ground, and you cannot use them to manufacture a negative voltage out of nothing.
As @analogoutput says, you need to invest a little in your power supply, since that’s the basis for everything else. The FC board is cheap and well-proven, but if you’d rather tinker yourself, see this article from Music from Outer Space (MFOS) about a supply that’s very similar to the FC design:
Thanks for the complex article, maybe I will finally understand basics : )
So, yeah, AC, now I remember, sorry. Like this one will be enough for 2x3U 120hp?
Interestingly enough, it has two 12 V outputs, but not clear if they’re floating (in which case you could configure them as ±12 V, but if they’re not that configuration is an instant short circuit).
Nah, thats the size of the case, it will take me much time to fulfill it.
Yeah, I just updated for 2 devices in previous post I found used in my country.
The two 12 VAC ones look fine, for use with FC or MFOS style supplies (note that you get ~half the AC amps out on each 12 V DC rail, so they’re good for 500 mA and 800 mA respectively).
