LZX - Cadet IV - Ramp generator

This is the fourth module in the series of LZX's Cadet DIY synthesizer.
Many thanks to Liz for making this possible.
A ramp generator is a signal generator which generates a ramp waveform.

It's actually a dual ramp generator which "creates 3 different fixed frequency ramp waveforms locked to the horizontal and vertical dimensions of a video display".
That 14 pin input header in the pic below is where the horizontal & vertical sync signals enter the module.
Modules with 14-Pin Sync Outputs include Visual Cortex, Video Sync Generator and Cadet I Sync Generator.

This will be essential if I want to do some vector rescanning.

The LM6172 op amp
This is used a lot in the cadet series. Get lots of these !!!

 The TL431 - buy this in bulk too.

ICs (and other impt components) used in this build:
LM6172IN/NOPB  (x2) ...this is a dual op amp... specified at ±5V power supply for low
                                 voltage applications such as portable video systems.
TL431BQLPR (x3).... Adjustable Precision Shunt Regulator
                               TL431 shunt regulator circuit explained 
TL072IP - standard op amp
SN74HC14N- - it's a hex schmitt trigger
TL074CN (x2) .....standard op amp
BS170 N-Channel...MOSFET...metal-oxide semiconductor field-effect transistor.
           used for switching or amplifying signals.

The SN74HC14n .... its also used in the Cadet IX VCO  though I don't think its responsible for the waveform generation in this circuit (please correct me if I'm wrong).

I think the ramp generators are built using mostly transistors.(2N3906/BS170)
For this to work, the voltage must be very precise... thus the use of the TL431.
This waveform increases steadly as the capacitor charges until it hits its peak and then decreases suddenly as the capacitor discharges.

Since this waveform repeats over and over again, this waveform generator appears as an oscillator.

iT'S DONE !!!
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Links:
LZX official
Muffs - Cadet series DIY/assembled
All about ramp generators
Youtube  Ramp Generator Circuit built with Transistors

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