27-03-2021, 09:01 AM
Its quite easy.
On my Hitachi scope you need a negative going video input and about 5v p-p drive to the Z mod, one BC109 as an amp which reverses phase (common emitter) does trick, a 555 timer as sawtooth oscillator and a 1551 chip as a frame sync separator to lock the 555 timer. It does all frame speeds perfectly. The frame output is fed to the X input switched to DC and the scopes timebase takes care of the line scan, works a treat.
It's better with other scopes that don't have the graticule embedded in the CRT and have better focusing. My trusty Tek scope blew up a few years ago and is beyond repair.
On my Hitachi scope you need a negative going video input and about 5v p-p drive to the Z mod, one BC109 as an amp which reverses phase (common emitter) does trick, a 555 timer as sawtooth oscillator and a 1551 chip as a frame sync separator to lock the 555 timer. It does all frame speeds perfectly. The frame output is fed to the X input switched to DC and the scopes timebase takes care of the line scan, works a treat.
It's better with other scopes that don't have the graticule embedded in the CRT and have better focusing. My trusty Tek scope blew up a few years ago and is beyond repair.
