further notes on the circuit

from building:

• tried skipping the power regulator part and going 5v straight into the ic -> seems to work quite well
• lm317 is adjustable voltage regulator - ouput voltage is 1.25*(1 + r2/r1) where in this case r2=1k and r1=220ohm. so voltage output should be around 7v. confirmed this when building
• i measured the current from the lm317 and was around 20mA so could also use the smaller/cheaper part
• tried with 200ohm , 1k and 100k pots. all were quite interesting. i would choose 1k pots myself.
• tried with some different cap values. no cap connected gives closer to a clean signal. higher caps tend to just give dropouts (with a few hard to tune effects) lower values seems most interesting. i would experiment some more with which cap values to use.
• i tried to figure out which way to orieintate the pots to make most sense. still it is not that obvious to me. would have to play around with the circuit some more to fine tune this.
• i tried switching -in/out of second opamp to see if liked the effect better but it wasnt as interesting.
• i tested with ntsc and it seems to give better colour glitches than as i remember with pal

the schematic

here is a handdrawn schematic of my interpretation which we will try to create in kicad:

some kicad shortcuts

Schematics shortcuts:

• a to add symbol
• m to move symbol
• e to edit symbol
• c to duplicate symbol
• w to draw wire
• esc to return to pointer tool

pcb_route shortcuts:

• m to move item
• x to route track
• v to add via
• esc to return to pointer tool

links to parts used: