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51
Building your own stompbox / Re: GGG ITS8 help
« Last post by Govmnt_Lacky on Yesterday at 02:37:03 PM »
Just noticed that you have yet to post up some voltage readings from the IC (4558 I presume)

Can you do that?
52
Building your own stompbox / Re: GGG ITS8 help
« Last post by Phoenix60 on Yesterday at 02:27:59 PM »
From SmallBear. 3mm red diffused.  LED T-1
53
If you just want a tube preamp for those occasions, that's a simple build.   :icon_wink:
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Building your own stompbox / Re: GGG ITS8 help
« Last post by Govmnt_Lacky on Yesterday at 02:04:43 PM »
Where did you source your LEDs from? Are they Red diffused? 5 or 3mm?
55
It looks like it should work.  Note that it omits the additional components of the Phase 45.  No big whoop, just not "authentic".  Note as well that it also omits feedback entirely.  Again, not a problem, just not authentic.  The vibrato/phase switch will work.

I will also recommend replacing R26 with a 500k pot (wired as variable resistance) and a 510k fixed resistor, in series.  This will allow you to adjust the offset or "range" of where the phasing takes place.  It's a simple and very useful mod.  Set the pot/resistor combo for max resistance (around 1M in total) while tweaking the trimmer.  Once you've set it for the lowest, most "gurgly" phasing, THEN you can start playing with the 500k pot.
56
Building your own stompbox / Re: 1 pot, 2 switches or vice versa?
« Last post by MikeA on Yesterday at 01:37:45 PM »
Two pots, one switch would be most versatile and least annoying.  You can set the pots and leave them at the proper levels, rather than adjusting one pot every time you switch FX.   The switch type and wiring scheme depends on your answers to the previous questions from antonis and Kevin.   
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Building your own stompbox / Re: GGG ITS8 help
« Last post by Phoenix60 on Yesterday at 01:30:36 PM »
No :(  I've got the drive all the way up and I'm strumming hard.
58
Building your own stompbox / Re: DOD FX-25 filter-type mod confirmed
« Last post by daeg on Yesterday at 01:19:50 PM »
I'm going to try this 'Balance Pot' idea in the next week or so. I'm thinking of trying a 10k pot with series with a 10k fixed resistor.

                                        [Env Follower]
                                                  ↓
                                        [10k Resistor]
                                                  ↓
Amp Bias Input A (Pin1)  ← [b10k Pot] → Amp Bias Input B (Pin16)


Do you guys think that will have a noticeable effect? Can we think of the 'Amp Bias Input' as having an input impedance?
My understanding of OTAs is weak and I can't find that info on the LM1700 data sheet.

59
Building your own stompbox / Re: Rockman Chorus Pedal
« Last post by antonis on Yesterday at 12:49:27 PM »
Sorry but I can't follow you..  :-\

The high impedance input of the op-amp is connected similar in the chorus circuit as a voltage divider. By connecting to the high-Z input, the only current that flows through the resistor will be the input bias current to the op-amp.

Through which resistor..??
60
I was thinking about doing something like this, I don't know the source but it seems reasonable:




fact is I don't know which of the TL064 op amp are the 2nd and 4th stage and where the R is located...
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