[sdiy] Passive Ring Modulator/Transformer Question

[Scott Gravenhorst]

Here is another approach that uses resistors instead of transformers:

http://home1.gte.net/res0658s/diode_ring_modulators.gif

I got this from someone on the list ("Jaroslav Lukesh" lukesh at k-net.cz) a
while ago.  I have not yet tried it, but this approach eliminates the need
for the transformers.  Unfortunately, there are no values given for the
resistors, but my guess would be that they are somewhat low and that the
circuit should be driven by amplifiers with low output impedance.

xyzzy at sysabend.org wrote:
>On this Ring mod thread, figured I'd pass on some info.
>
>On Synthfool there is a classic ringmod
>http://www.synthfool.com/ringmod.html
>
>Lists the Stancor A4713 transformer, which I contacted Stancor about to find
>the specs and low and behold they sent them! ( thanks Stancor! )
>
>Type
>Driver: Single plate to push-pull
>Primary Imp in Ohms : 10k
>Max Pri DC MA : 30
>Ratio Pri.: 1/2 Secondary : 2:1
>Audio Watts : 5
>DC Resistence
>  Pri : 550ohms
>  Sec : 875ohms
>Freq Responce : 100-20000 ( +-3db )
>RMS Test voltage : 1500
>
>
>Now, just so a second ( or 3rd or 4th ) set of eyes can double check
>something,  if primary is 10k and seconday is that 2:1 1/2 ( wouldnt it have
>just been simpler to give the friggen value unstead of an equation? )
>That'd make the secondary, urm, 10k center tapped?  If so theres a
>transformer at Mouser that'd be almost perfect for $2.  The 42TM018.  DC
>resistence is a little lower but hey.
> 
>-- 
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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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