Ross Ropez with (almost) every conceivable mod/option known to man..........

[frequencycentral]

I've got boards for the Ropez on the way from John Lyons, the main board and the extra stages board. I'm thinking of making this build 'control overload', ie as many (useful) options as possible.

The options I'm thinking of are:

- vibrato switch
- 4/8 stage switch
- phaser/filter switches (one for each stage - 8 toggles!)

I'm not so interested in univibe mods, I'll stick with the stock cap values.

I came across this thread: http://www.diystompboxes.com/smfforum/index.php?topic=74337.0 and wondered how useful it would be to include Width and Intensity control?

Also, any comments on the individual phaser/filter toggles for each stage?

[jacobyjd]

You have a sickness, Rick. 

[frequencycentral]

You have a sickness, Rick. 

No - I just got a real deal on 50 toggle switches. 

[jacobyjd]

You have a sickness, Rick. 

No - I just got a real deal on 50 toggle switches. 

Hah--then you should be building that PT2399-based tape echo simulator some of us were trying to figure out awhile back. 4 heads, switches for feedback, routing, etc.

None of this phasers gone wild business--you need to guinea-pig something that hasn't been done! :-P

[frequencycentral]

You have a sickness, Rick.  

No - I just got a real deal on 50 toggle switches.  

Hah--then you should be building that PT2399-based tape echo simulator some of us were trying to figure out awhile back. 4 heads, switches for feedback, routing, etc.

None of this phasers gone wild business--you need to guinea-pig something that hasn't been done! :-P

PT2399-based tape echo simulator! I have 5 spare PT2399 - let me at it! Where is that thread??

[jacobyjd]

I've been wanting to chase down this concept ever since the first post of that thread came up, but I haven't really had the time, funds, or need to make it happen. The thread gets pretty deep into what actually happens inside a tape delay.

(sucker...:-P )

[frequencycentral]

Any thoughts out there in DIYland, (apart from "you should be building that PT2399-based tape echo simulator some of us were trying to figure out a while back - none of this phasers gone wild business") ?

[Mark Hammer]

There will be an issue with breaking into oscillation when the regen is turned up using 8 stages.  I recommend having another toggle to select between full and lo-cut in the regen path.  Lo-cut would involve having a smaller capacitance value than the 1uf seen on the output of the Regen pot (.047uf?).  Use that when you switch to 8 stages, or simply for a different kind of Regen sound.

If a feedback resistance larger than 15k is used on the mixer/output stage, you'll have a volume boost, and the option to use an output volume pot to set your desired balance.  I upped the 15k to 33k on one of mine, and replaced the 150k terminating resistor with a 100k log pot and a 47k fixed resistor to ground from the ground side of the pot.  That lets me get something a bit louder, and something a bit softer, than the input signal if I want it, as well as true level balance.

[Processaurus]

LFO options are nice, especially stairstep or sequencer or S/H waveforms, as is an LFO freeze button, to stop the sweep.  I was going to make a krazy phaser out of a couple phase 100's lying around at some point with one of those molten voltage tap tempo chips, maybe drive a sequencer section with the square wave from it.

[jmasciswannabe]

Is there a way to freeze the LFO and then manipulate it with an external foot control so that you have an adjustable phase filter. Hope that makes sense. Hmmm...actually that just made me think of using an expression pedal on the electric mistress in filter matrix mode on the depth pot. Something along those lines.

[jmasciswannabe]

This also reminded me of a mod someone was going to attempt by running two boards together in order to achieve a sample and hold option. I don't think it was ever fully explored, though.