modem help

From: Peter C. Wallace <pcw_at_mesanet.com>
Date: Sat Oct 26 10:27:01 2002

On Sat, 26 Oct 2002, Eric Smith wrote:

> Ross Archer <archer_at_topnow.com> wrote:
> > Two half-wave circuits with diodes conducting in opposite
> > cycles has to be the cheapest way to get bipolar supplies.
>
> Unless you have AC with a center tap, how is "two half-wave
> circuites with diodes conducting in opposite cycles" different
> than one full-wave rectifier? Maybe I don't understand how
> your suggesting it would be wired? Perhaps some ASCII art
> would help. (Doesn't have to be fancy.)
>
> Thanks,
> Eric
>
>
>
>




lead 1 of transformer is ground,
lead 2 of tranformer goes to anode of diode A and cathode of diode B
+ 1/2 wave power comes from cathode of diode A
- 1/2 wave power comes from anode of diode B

The diodes conduct on opposite cycles (like a full wave centertap supply) but
in this case one diode generates the + supply and the other generates the -
supply...




Peter Wallace
Received on Sat Oct 26 2002 - 10:27:01 BST