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Triple Comparator with Schmitt Trigger?
MUFF WIGGLER Forum Index -> Buchla, EMS & Serge  
Author Triple Comparator with Schmitt Trigger?
Hey all,

Just starting to get into a restored Serge panel that has a Triple Comparator with a Schmitt Trigger on it.

What are some of its uses, what gets it going? A starting block would be great, thanks. Do I put in one wave on the top, one on the bottom, adjust the waveshape knob and then it sends out a trigger or alternate waveform? What should I be doing with it? Can I chain them?

Also what are some applicable uses for Schmitt Triggers? There is one on here as well. It's just an old school one with an in and an out.
In short:
Comparator: good for level detection (you can set when it reacts / threshold) or squaring signals.

Schmitt Trigger: also a comparator, but you cannot set the threshold yourself. It detects when a signal (any signal) is high or low.

Details (from the web):
Logical Decisions: If the + input is greater than the – input, the output will be high. If not, then the output will be low.
• Level Detection: A pulse will be generated whenever an input voltage reaches a pre-set threshold.
• Voltage variable pulse width modulation of any oscillator input.
• Squaring audio signals, whereby frequency related pulses are derived from an input signal. These pulses can be used for frequency sub-division, or as raw audio, rich in harmonic content.

In addition to the +/- inputs, each of the Comparators include a front-panel knob to manually set a threshold.
The module also contains a single, non-adjustable, Schmitt Trigger. This is similar to the Comparator except that it has been optimised for squaring up audio signals. The Schmitt Trigger is a single-input comparator with hysteresis. Hysteresis means that the switching thresholds are different for an input signal depending upon whether the signal is going up or down. This feature can be used with an envelope and VCA fucntioning as a noise gate to reject low-level background noise in audio applications.
The Schmitt Trigger can also be used for level detection.

Here how it is done:

I hope it helps.
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