passive ring modulator

[guitarhacknoise]

[quote="Paul Perry (Frostwave)"
A warning sign: when the bleedthru changes as you put the base on  :x  :cry:[/quote]

I'm not sure I understand,  
The bottom plate?
-matthias

[puretube]

In my opinion, it is virtually impossible to totally null out the carrier in a passive ring modulator.
You could put a noise gate after it, though.

noise gate before the carrier-input, side-chain controlled by the input signal...

[Paul Perry (Frostwave)]

noise gate before the carrier-input, side-chain controlled by the input signal...

Well, of course (slap my bald head) PureTube is right! again.  

and for guitarhacknoise, yeah, i mean the bottom plate.. dont you just hate it when everything is 'just right'.. until the bottom plate goes on :x  :cry:

[guitarhacknoise]

paul perry writes:
dont you just hate it when everything is 'just right'.. until the bottom plate goes on.
At least I know I'm not alone!

[toneman]

how bout an 8038 for sine/square/sawtooth outputs?
All in one chip!!
What xfmrs are used in the RingerStinger??
1K primary AND secondary??
Was that the the Mouser # refered 2 earlier?
( TL016-0416S )  ??
I have a jpg of the RingerStinger xfmr&diodes....
No #'s on the xfmrs that i can see.....
afn
staymodulated, cleanly
tone

[guitarhacknoise]

hey Toneman,
8038 seems like a cool chip, I'll need to look it up.
have no info on the ring stinger trans.
the Mouser # for the trans. I'm using is actually  42TL016 , sorry.
the specs be:
pri imp.=600ct.
sec imp. = 600ct
pri. resistance =65 ohms
sec. resistance = 55 ohms

I wonder if this would be better?
42TL030
pri. imp.=100ct
sec. imp.=100ct.
pri. res.=10.9 ohms
sec. res.=9.1
-matthias

[Taylor]

the Mouser # for the trans. I'm using is actually  42TL016

Thanks. Does anybody know where to find the matched diode cases referenced earlier?

[Taylor]

Does anybody know where to find the matched diode cases referenced earlier?

So I got some samples of the uc3611 diode array from Texas Instruments. I got 5 in the "N" package, which is an 8-pin DIP, and 5 in the "DW" package, which is a 16-pin DIP (but the package is the same size; the pins are twice as close together). But they both only have four diodes in them; 8 of the pins on the DW don't seem to do anything, according to the datasheet. Is this common? Does it have to do with fitting into a different standard, or do the pins actually do something?

[Taylor]

So I built this with the TI diode array a while ago and it sounds great. I'm using an old Farfisa organ with a few keys taped down as a carrier, and it's totally quiet when there's no guitar signal going in (actually, I use a bass). I'm not using any boosts or buffers or anything, so I've got a weird, dissonant, ugly effect with a total of 3 components. I'm happy.

I wanted to get some xr8038's for carrier signals, but those guys (Exar) are crazy about samples. I made the mistake of giving them my home phone number and a kind-of-fake company name, and they called me a few times a day for weeks, trying to arrange a time for their reps to come meet me and tour the facility. If anybody with realer credentials would like to help me out, or if anybody knows where I can buy them, please let me know.

[toneman]

U can get 8038's from Jameco.
at least U used 2.
U could also build a descrete VCO with simultaneous waveforms out.
Did U look at the Mouser site???
these are a common IC function generator.
The 566 VCO is harder to find, but will work OK also.
staymodulated
tone

[Paul Perry (Frostwave)]

I found the 8038 a bit annoying. It's a pretty thirsty chip, for those using batteries. And it's difficult to gt a "full" audio range out of it. Midwest Analog had a circuit showing how to get the most out of it (ingeniously overcoming the inherent faults). But Midwest has gone, now.. maybe someone will redraw & post the circuit, if they have it?
I gave up on the 8038 myself, for my commercial ring modulator, and use an OTA as a voltage controlled oscilator, followed by another OTA as a triange to sine shaper. Wider range, and just as good a sine, in my opinion.

[toneman]

Hey Paul,
that would B the best way IMHO.
i like 2 stay away from "special" chips.
there's always the *famous* 555.
Make it do a triangle, then lowpassfilter it.
Nearly pure sine...
...BTW U need to buffer the tri or the sine 2 drive other stuff.
staynonobsolete
tone

[brett]

Might mention that CMOS 555s are usually the thing for stompboxes.  555s chew battery power, and can really throw out noise, esp via the power lines.
cheers

[toneman]

*not*  the CMOS 555.
*very* LowPower.
You're still running batteries???
:shock:

[Taylor]

So I realized that the reason my RM works so well with no boost is that I play an active bass. Indeed, I'm a quick one.