CMOS Tap Tempo...anyone done it?

[Matthew Sanford]

Love, love, loving Lancaster's "CMOS Cookbook" (Thanks Paul R!). I've been devouring it (gonna read it a second time to retain I'm sure) and thought about Tap Tempos once through the monostable portion, so a quick search got me this from 1983.

Couple questions, has anyone made it? Also, it shows that it gets tapped tempos down to 60 BPM or 1/second, with a 500Hz clock frequency. I know I can do division after to get longer pulses (and plan to anyway to have different things synced but at divided tempos) but would changing the resistor R2 on IC3a,b,c "ring of three" to something lower give longer times available? To be honest I was racking my brain because I thought the 500Hz was the 1 second and doing X2 gave twice the rate, but then saw that it said it was at 250 Hz then after switching to "X2" counts from 500 Hz giving the double amount of pulses. In my long winded way, just asking if changing it to say 820R would then give the availability of 10 second pulses, and would it negatively affect the astable due to low resistance in that spot?

Thanks everyone!
The schematic:

[PRR]

> if changing it to say 820R would then give the availability of 10 second pulses, and would it negatively affect the astable

*Always* change frequency by changing capacitor(s). The resistors were designed(?) to set bias, power current, minimum loading. Capacitors hardly ever change anything but frequency/rate/time.

[Matthew Sanford]

> if changing it to say 820R would then give the availability of 10 second pulses, and would it negatively affect the astable

*Always* change frequency by changing capacitor(s). The resistors were designed(?) to set bias, power current, minimum loading. Capacitors hardly ever change anything but frequency/rate/time.

Thank you, I was thinking on it leaving work after posting I should just change to 10n. Well, also reading for RC time constant R should be 4k7-1M. Still wondering on what can go between to create sync inputs on effects without them, and gotta get chips and through some other stuff first, but think this would be good in a stand alone with different frequency dividers, buffers, inverters, maybe some monostables to boot, to sync a bunch of other things together.

Thanks again Paul for leading this horse to water, I swear I'm taking drinks!

[Matthew Sanford]

So I am going to jump into breadboarding this (after cleaning and reorganizing the lab). For the ring of three setting the rate to grab taps, I figure I'll make the 100n a 1u which should make it almost 10 seconds. I realized the current way is to allow it to allow a lot more availability in the rate to read the taps (500/second whereas I'll make it 50/second).




I'm excited to get started on it. Not only do I plan to have tons of Druid chips around which are sync able, I was also thinking to put an in switched jack for the comparator/integrator triangle generators I am putting in effects, so it would sync that wave too although the 1M pot on the integrator would (I assume) set it's depth in that case.

If interested, the site is url'd to the text "this" in the first post part.