8/9/2019 intv_vmod
2/2
Video = modulator pin 1 (counting from edge of board)Audio =
modulator pin 3
Intv 1 5v Bottom of C20 (farthest from edge of board)
Gnd Go to bottom of R22 (farthest from edge)
Right over to C17
Right one more to empty terminal with thick trace
Intv 2 5v Go between lettering for U12 and U13 then a
little to the right (light green)
Gnd Right side of C20
Back
Pgina 2 de 2Lab Rat: intv composite mod
17/6/2010http://www94.pair.com/jsoper/intv vmod.html
For the Intellivision 2, you can tap GND at any of the many open
pad points around the boundary of themotherboard. For +5v, one
handy location is near U12/U13. The figure below shows the +5v
trace of interest.(Note that the AY-3-8916 may instead be an
AY-3-8914. The two AM9114s may instead be two 2114s.)
For Intellivision 1 and related systems, the cleanest option is
to tap directly off the main power supply board.Pin #1 on the power
supply board's output provides +5v. Pin #4 provides GND. You can
tap these either nearthe connector, or at convenient points
elsewhere on the board.
COMMENTS
I replaced my old circuit with this new one designed by Joe
Zibiciak (with Tim Lindner coordinating).
It uses a pair of common-emitter amplifiers to give you voltage
gain in addition to current gain.
I built this and was very happy, just had a very slight ghosting
effect on dark screen characters which
was probably my workmanship.
Thanks guys.
You can solder the AV cables in directly or mount RCA jacks onto
the console case.
Either way, remember to ground the shield (outer conductor) Once
you do a AV mod, the RF output really
become ugly, because the circuit acts like an rf antenna, so
don't be surprised.
Intellivision-1s require a lot of work and a hot soldering iron
to get the metal shield enclosure off.
If the RF video looks OK, you might just want to leave it
alone.
They also have an internal transformer with 120V connections so
don't shock yourself or start a fire.
My intv1 eventually went bad, I stick with intv2s now.
That being said, intv2s have very little space to put
things.
I placed my video circuit in the top right corner of the case,
but this meant a long video wire to themodulator. Some games have
distortion on the top of the screen and this may be why.
By the way, those extra circuits in the bottom part of the
picture are to adapt genesis controllers.
