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Easy, just switch the now floating 10k mixing resistor to be in parallel with the original filter resistor which you've changed to 10k which gives you 5k/4n7 which is exactly the same cut-off as 4k7/5nF. Might not be the best place to mix dry in, but it's a relatively simple solution.

If you don't mind your clean getting tone controlled and you're not too precious about the circuit you could always turn one of them fancy 4k7/5n filters in to 2 x 10k to get your mix tap and use a 4n7 cap.

It just lessens the response of the 220n/10k hi-pass a bit, so you get more bass passing through. Good for bass players? Some seem to prefer less bass on the wet side; solved by reducing C3's value.

Right, so, quickly tossed this together, I've shifted the mixing trim to the BBD input to account for the new chips lack of headroom and the insertion loss difference between the two chips. It's not an ideal solution as it messes with the bass response a bit... but I couldn't think of a better...

Oh and no need to bother with the original zener based regulator, it'll give a hair under 6V out, just lift the ground pin on a 78L05 with a pair of 1N5817 or 1N4148 if you want a tiny bit more sweep, should be close enough. Just use an LM1458 for the LFO rather than bothering with individual...

No, LDR's aren't linear in response but I'd be more concerned with finding one with a good resistance range to get a decent sweep ratio over that sort of nuance... LDR's age, an original unit isn't going to give the same response it did when new either.

Depending on the clock frequencies required, an MN3007 might be fine? The SSI isn't a bad chip as such, it's just not the circuit I'd pick to drop it in, in an ideal world we'd have access to MN3004 but beggars can't be choosers in this day and age; kind of an irritating circuit in general to...

When we say clock it's a bit of a generalisation as there's several components to it... a modulation element, an oscillator and usually, a flip flop to provide both phases i.e. the tick and tock of a clock. The square wave 'clock' directly connecting to the BBD isn't what changes the sound...

Yes the schematic is wrong, what's all the +1, +2 business about though? So (excuse the quick shoddy drawing) you want the attached. Don't worry about testing it at +9V or +5V, looking at the SSI datasheet this morning, it doesn't have an internal divider akin to the Reticon chips as I...

I'll tell you what, I'll reimagine the audio path for you to suit the new chip, you don't need the 4049 any more and may as well just use a different oscillator (anything that runs on 5V happily should be fine) and then the LFO is, well it's just an LFO driving an LED. If you build just the...

You'll also have to contend with how the mixing is done here... the TDA1022 has a lot of signal loss, so the mixing resistor (albeit partially determined by trimming) is of smaller value than the dry to compensate. Unfortunately for you, said mixing is part of the output low pass filter and by...

Do you know how to make the clock circuitry compatible with a 5V chip?

If you flip the resistor chain, pin 13 gets 1V(ish). It's just -9V because of the TDA1022 datasheet. I did say not far off; I worked it out properly last time I looked at it.

I think I have a schematic drawn for it with +9V, remind me in a few days time. It's pretty easy really, not far off just literally flipping the polarity on everything.

Maybe I have been, maybe I'm in the room with you right now... :eek: Or not. Yup, I'm partially back and have returned to spread flippant remarks and unsolicited advice. Thanks for the welcome :)

I seem to remember it taking us about 6 or 7 prototypes and over a year to get the DandyHorse PCB working reasonably and I recently "redesigned" the MN3007 Echo Flanger for PastFX with every improvement I could think of, comparing it directly to original units and using all I had learned in the...

Hello... That's mildly amusing, I've worked for PastFX too. It's not an ideal solution as the clock won't be as clean as a divider would provide but you'd need to increase the clock frequency by 4 times otherwise. You need to split the oscillator output so you have the opposing phase, use a...

In that case, try poking the wire away from the 4011. I will say though we've been having issues with more recent production LT1054 chips introducing heterodyning (which can appear as a swoosh), we thought the Karaoke had been immune with the heavier filtering but perhaps not the case for...

LFO noise as in tick or more a swoosh? If it's tick, try poking your ground wires around a bit, they're dangling over the 358 LFO op amp.

:ROFLMAO: That one was my fault! BBD's were originally used heavily in Karaoke units and it just kind of worked for the Chorus sound. Naming is honestly the worst bit of the whole PCB affair. I'm glad you're digging what you've heard out of it so far though and it sounds like you're another...