>
>In message <+58MpKAl5+L3Ew5U@txrx.demon.co.uk>, Steve Thompson
><amps@txrx.demon.co.uk> writes
>>
>
>>PPS I've no axe to grind here - According to Spice using the figures I
>>guessed at, the doubler does not deliver significantly lower ripple and
>>puts everything but the transformer insulation under greater strain.
>
>Now I've woken up properly, I realise that the strain on the insulation
>is just the same...
>
? agreed, Steve. As I understand it, the trade-offs are that the FWD
filter requires twice as much capacitance and the FWB transformer
typically needs about 1/3 more layers of paper insulation.
// There is a simple circuit for switching a power supply from FWB (for
RTTY, FM and CW) to FWD (for SSB). - - see Figure 3 on my Web site.
- cheers
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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