DanElectro “Green Ringer” MODS-redux // jcm(c)2020
In 2003 I put out a mod that when applied to my Green Ringer clone made it work and sound better … I called it my “GREEN RINGER NULLING” mod!
To be fair, this made sense from a theoretical point of view as it would match the driving point impedances at each (anti-phase) driving nodes … a basic hand-analysis thing
I realize now that my technique can only correct for component mismatches in one direction only, only working 50% of the time … in other words, I had gotten lucky on that day …
A better approach is to work towards balancing the FW circuit instead, which is done by matching all components involved in the lateral FW circuit paths …
So, take out your DMM and match all corresponding resistors, caps and diodes related to the full-wave section (see the updated schematic below)
Perfectly balanced circuit simulations show there is no real need for a NULL/BALANCE control …
GREEN RINGER “redux” // JCM2020
Here’s an all-NPN version of the DanElectro Green Ringer circuit … extra mods take the basic GR idea a little further while including three somewhat well-behaved controls for added flexibility …
The circuit features a BIAS adjust trimpot, a continuous DRIVE control that brings the front-end gain up to 44db total, a variable TREBLE-CUT before going into the rectifier and an output volume control.
SIMULATED LARGE-SIGNAL GAIN SPECS
With the the HI-CUT circuit disabled and DRIVE control set to 0 the AC circuit gain produces a slightly stronger output waveform than the stock circuit does – shown here driven from a 200mVpp (rough Strat PU levels) signal source…
At high DRIVE the output can get severely distorted from the same source …
