Home |
Search |
Today's Posts |
#2
![]() |
|||
|
|||
![]()
On Nov 28, 9:23*pm, MarkAren wrote:
Hi Guys, Ages ago I saw a very simple circuit - a CT transformer, couple of caps, 4 rectifiers and a change over switch. With the switch in one position, the circuit was a bridge rectifier, in the other, a voltage doubler. Pointers please, I have forgotten where I saw this... Thanks, Mark Just draw a standard bridge rectifier circuit, bridge across the full transformer secondary, filter capacitor at the bridge output. Now-- break the connection from the capacitor (-) to the bridge, and put in a SPDT switch, wiper to the cap (and to ground, if you will) and the two possible connections to either the bridge negative output, or to the transformer secondary center tap. There's no problem connecting to the transformer center tap with the bridge (-) floating. You can also use this basic circuit to supply two voltages at once: connect up a bridge circuit, and ground the bridge/cap (-), and also put a cap from transformer CT to ground. The bridge output (peak) will be nominally 1.4* the RMS transformer full secondary (minus a couple diode drops), and the CT output will be half that. Or, you can ground the CT and have + and - nominally equal voltages, assuming the loads on both sides are similar. Cheers, Tom |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Simple wideband audio amplifier circuit? | Homebrew | |||
voltage drop of a old silenium rectifier | Homebrew | |||
Why different rectifier diode voltage ratings? | Homebrew | |||
Why different rectifier diode voltage ratings? | Homebrew |