Initial efforts on getting some vector rescanning.
I'm using a LZX video synth and a Tektronix 620 monitor.
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tHE patch is very simple.
Horizontal ramps into the X input.
Vertical ramps into the Y input
Video from the camera into the LZX "Color TBC" and out via the Color video encoder.
This video signal is then plugged into the Z input
The Passage, Bridge are boosting the signals
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Patch 2
Slight variation on the first patch.
I'm now mixing the video signal into all 3 inputs.
Ramps and still going into the X & Y ins
There is a old saying in the audio world: "You can never have enough VCAs"
Maybe this is a bit simplistic, but I'm seeing the Multiplier as a VCA for video.
(its much more than this too).
These are some pics of the Cadet DIY modular video synth build.
I am an independent builder and have nothing to do with LZX industries.
These aren't official build notes, just my records to help me trouble shoot.
It's a work in progress.
Do let me know if you spot any errors or omissions.
This is module no.10 (Multiplier X).
It doesn't require the 14 pin sync cable.
It's described as "Cadet X Multiplier is a variation on the Cadet VI Fader circuit,
configured as a switchable 2-quadrant or 4-quadrant multiplier".
So if I understand this correctly, in 2-quadrant mode it it acts like a VCA and in 4-quad mode it behaves like a ring-modulator..... "it crossfades between an inverted version of the input signal
and a positive version of an input signal"
2-quadrant mode = VCA.
You can control the amplitude with a control voltage (0 = no signal & 1V = max signal)
4-quad mode = Ring Modulator
The amplitude of the output is again controlled by CV.
When CV is negative ( -1V for LZX = max inversion) signal gets inverted.
When CV is positive ( +1v on LZX = max amplification) signal is non-inverted.
LT1251CN#PBF - iTS a 40MHz Video Fader and DC Gain Controlled Amplifier
It's probably the core component of this module. Looks very useful if you are designing your own circuits like the fader and amp below. But its not cheap. Mouser sell them for $16 AUD each.
And yes, this same chip is used in the Cadet VI Fader module.
ICs and special parts:
TL072IP
LT1251CN#PBF ---- 40MHz Video Fader and DC Gain Controlled Amplifier
LM6172IN/NOPB
TL431BQLPR
Some pics of the Cadet DIY modular video synth build.
I am an independent builder and have nothing to do with LZX industries.
These aren't official build notes, just my records to help me trouble shoot.
It's a work in progress.
Do let me know if you spot any errors or omissions.
This is module no.9 (VCO IX).
LZX describe it as a wideband triangle core VCO.
ic'S used:
LM6172IN/NOPB --- this is a dual op amp... specified at ±5V power supply for low
voltage applications such as portable video systems.
TL431BQLPR ----- Adjustable Precision Shunt Regulator TL431 shunt regulator circuit explained
TL072IP - standard op amp
SN74HC14N - it's a hex schmitt trigger
CD4066BE - CMOS quad bilateral SPST switch
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I'm guessing that the SN74HC14N is being used as the schmitt trigger oscillator.
If I'm reading the schematic correctly, a square wave is developed from the Schmitt trigger and the triangular wave is developed across a capacitor. They are output through buffer amplifiers (LM6172).
(Another IC that would probably do a similar job is the 40106 - also a Hex Schmitt-trigger Inverter..
or a 74HC4046... phase locked loop ??? ................... a couple of thoughts for another day)
DPDT & SPDT switch (on on). These aren't right angled, so I'll have to hand wire them.
Some pics of the Cadet DIY modular video synth build.
I am an independent builder and have nothing to do with LZX industries.
These aren't official build notes, just my records to help me trouble shoot.
It's a work in progress.
Do let me know if you spot any errors or omissions.
This is module no.7 (Hard Key Generator VII).
It's a wideband voltage comparator with voltage controlled threshold level. A voltage comparator is an electronic circuit that compares two input voltages and lets you know which of the two is greater.
The ICs used are:
TL072 - a pretty standard Op amp
TL431BQLPR - Adjustable Precision Shunt Regulator
LM6172IN/NOPB - Operational Amplifier - Dual High Speed, Low Power
LM361N/NOPB - Analog Comparators Hi Speed Diff Cmptr
1stly, the power section - reverse voltage protection & 5V regulator
+The C8 hard key circuit can be adapted to provide a pulse width
modulation CV and output. Just send the triangle wave into the key
input and threshold becomes pulse-width.
Balanced audio cables will give you a better, cleaner signal than unbalanced cables.
Ie less noise.
Unbalanced (2 wires):
TS cable
TS stands for Tip Sleeve.
Tip = signal wire
Sleeve = ground
RCA cables
As the audio signal goes down the cable, it can pick up noise.
Therefor dont use in long cable situations (greater than 25ft)
There are just 2 wires in the cable.
1. signal wire
2. ground wire
The ground can act like an antennae picking up unwanted noise along the way.
Most of the noise comes from power cables.
Thus, try to keep the power cables away from your audio cables.
Balanced (3 wires)
1. Hot signal wire (positive)
2. Cold signal (negative)
3. Ground
Wires 1 & 2 have opposite polarities until the end when the polarity of the cold signal is flipped back
to match the hot signal.
TRS
Tip, ring sleeve
Tip = hot
ring = cold
Sleeve = ground
XLR
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There are lots of variations of this cable.
This is a 1/4" TS to 3.5mm TRS Mono Interconnect Cable.
It's designed to apply a mono signal equally to a mini stereo phone input. It
may be used to connect a mixing console to a portable media player,
laptop
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If you wish to wire a male XLR cable to a unbalanced monojack
Pin 2 is HOT / Positive
Connect this to the tip of your jack.
Pin 1 is ground/shield.
Pin 3 is your cold / negative
Connect Pins 1 & 3 to the sleeve
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The reverse is of course the case for a female XLR
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