September 27, 2019 at 5:08 am #6932
In emexar building note:
Under the “socket and see” approach try different clipping diode options such as Germanium, Silicon and Led. For example populating D1 and D2 with Germanium and Silicon in series will produce a unique tone with more available volume or gain. Try adding a Diode at D3 for Asymmetrical clipping. Again, socket and see. Adding an LED at D3 may produce a fat tone.
I have a Roto-tone deluxe and I would like to use it in order to have different clipping diode options, as you offers in the building notes.
Do you have exemples for it?
For Tone Tweq Pcb, I would use a pré/post toggle switch, but I’m not sure about it interest… Does somebody has already did this?
Have a nice day.September 28, 2019 at 11:51 am #6941September 28, 2019 at 12:43 pm #6942wilkie1Moderator
I am trying to find other pictures of diode clipping options for you.
As far as the ToneTwEQ switching, if you place EQ before other effects, you will change the tones that the effects are modifying. If you place the EQ after effects, you will be changing the sound that was already modified by the effects. So, you will get different results from the two positions. As we say, “Socket and see!” or, in this case, “try it and listen!”.September 29, 2019 at 7:11 am #6948September 29, 2019 at 12:40 pm #6950CybercowModerator
@fr4nk – I would leave D2 & D3 empty and connect the RotoTone across D1. Then on the RotoTone PCB you set up 4 different diode clipping configurations. See the attached image for examples. (And remember to socket the diodes on the RotoTone PCB so you try different diodes and configurations. Also note that different diodes have different Fvd (“Forward Voltage Drop) and some of the configurations may sound louder or quieter [allow more or less volume to pass] depending on the total Fvd across the different diode combos.)
Hope this helps.October 13, 2019 at 3:23 pm #7070
Cybercow wrote: Also note that different diodes have different Fvd (“Forward Voltage Drop) and some of the configurations may sound louder or quieter [allow more or less volume to pass] depending on the total Fvd across the different diode combos.)
Could I use trimpot to regulate it and have the same VFD for all? Which trimpot values could you suggest? If I’m right?October 13, 2019 at 5:18 pm #7073
I would like to try what is suggested in rototone doc but i’m not able to recognize which type are represented in this picture taken from the documentation:
- Germanium 1n34a (0,3 Fv)
- Red led (1.6 Fv)
- Silicon diode 1n4148 (1,0 Fv) or 1N456A
Or maybe it was juste to illustrate? 🙂October 13, 2019 at 7:58 pm #7074BillyModerator
Yes just to illustrate what you can do looks like
1. Germanium (1N34A)
3 Schottky (1N4001, BAT41 etc)
4 Silicon (1N4148)
All different forward voltages
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