This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music.
What about if I put 3 x 5.1v Zenners in series...would that work instead of the 1N4744A?
I cant work out what the 270 ohm resistor and the .15 ohm resistors do? It seems to me that the 270 ohm with the .15 ohm's are basically parralleling the 680 ohm (current limiting) resistor?
I'm only thinking that the less resistance in the output path is better???
This voltage us divided by the 270 / 680 ohm resistors, and then used to reduce the drive to the pass resistors if the output exceeds a certain value (about 12 amps with the values shown).
This in turn protects the supply from accidental overloads such as short circuit wiring or trying to run a 500 watt amp from it
I dont wanna teach monkeys how to eat bananas, but surely a 12A fuse would offer the same protection?
Also I'll be looking into filtering the mains input to the transformer too. (I know to be very careful with mains electricity as it can kill me) I have read something somewhere about doing it
lots of them have a fuse on the mains side of the transformer
the mains lead at the moment goes straight into the transformer (through a switch)
We do have what they call "Economy 7" over here, thats when between midnight and 7am the electricity switches to a cheaper rate for charging night storage heaters
I have found one at 109c. do you think this will be suitable?
Yes.I'm assuming here the supply has a metal case , connected to mains earth...
on our economy 7 system it puts all of the electricty on the cheap rate at night, so the normal power outlets are cheap too, so no "mods" needed (just a timer to start the washing machine after midnight ) the heaters are on a different circuit so they are only powered at night.It's a fairly common (though totally illegal) mod to wire a regular power outlet to the second circuit
Cool, I'll fit that in asap!so anywhere from 80 to 120 deg c will be OK.
if a load is connected whilst the power supply is turned on the fuse blows... if the crowbar circuit is disconnected this does not happen
and have noted that some crowbar circuits have an extra capacitor across A-K on the SCR to reduce false triggering
but which is best? or maybe I'll just add both
then I connect the load and thats what blows the fuse
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