[sdiy] DC Offset Injector?

[Scott Bernardi]

You could just as well make it with 100K resistors and use a 10K- 50K 
pot for your DC offset.  Run the pot between +/-15v (is that what you 
have for supplies?), run a 300K resistor from the pot wiper to the - 
input, a 100K for the feedback resistor, and a 100K from your LFO into 
the - input. Then you can adjust the offset of the output traingle 
continuously between (0 to +5v) and (0 to -5v).

Joe Kramer wrote:

>Hi Friends,
>
>My MS20 LFO generates a +/- 2.5v triangle wave, and this is fine for most
>of the internally patched functions.  But once you start patching out, there is
>an obvious need for a zero-to-5v wave, for instance when modulating one
>VCO against the ring modulator.
>
>Can I make a passive DC offset injector with, say, 10k resistors and
>pots and a power source--basically a mixer with the LFO as one input and
>a DC voltage as the other input?  If so, is 10k a safe all-around value?
>
>Or do I have to use an amplifier to do this?
>
>Thanks,
>Joe
>
>
>
>
>  
>

-- 
Scott Bernardi
sbernardi at comcast.net