Hi.
I am trying to replace a smoked IC in a dimmer control panel. The dimmer pack is a Playmate model (6 x 2400W) by Electro Controls (Control Lighting). It has a model number of CL-64B6A3.6. Electro Controls was bought out by Strand and closed many years ago. I am going to try to contact some folks who service these things, but I thought maybe this group could look at a schematic and say - "thats a xxx IC just from the schematic." This unit was likely built around 1982
It has a 6 slider control panel with a 7th slider that is the master.
There is a circuit board on the master that has an 8 pin integrated
circuit that controls the master level. This IC has burned up and
left no identification markings on the top of it (just a charred
circle).
It is fed by about 18 Volts DC from the dimmer rack and the dimmers
appear to operate 0-15v (it may be 0 to -15). The PC board with the
IC on it is about 2" x 3" and has "PC279 Rev C 5Nov82" as markings on it.
The smoked IC somehow conditions the output of the master fader to drive a PNP transistor which provides a 0-15volt bus which the rest of the faders then use to drive individual dimmer channels.
Best guess at a schematic is something like below. The 8 pin IC is the question mark. It takes +18 on pin 8 and Gnd on pin 4. No -ve supply. I'm guessing something like a LM324 (but a dual instead of quad?) It's been 15 years since I dabbled much with this stuff.
Anyone care to make a guess what this IC was?
Thank you
David Meed
I am trying to replace a smoked IC in a dimmer control panel. The dimmer pack is a Playmate model (6 x 2400W) by Electro Controls (Control Lighting). It has a model number of CL-64B6A3.6. Electro Controls was bought out by Strand and closed many years ago. I am going to try to contact some folks who service these things, but I thought maybe this group could look at a schematic and say - "thats a xxx IC just from the schematic." This unit was likely built around 1982
It has a 6 slider control panel with a 7th slider that is the master.
There is a circuit board on the master that has an 8 pin integrated
circuit that controls the master level. This IC has burned up and
left no identification markings on the top of it (just a charred
circle).
It is fed by about 18 Volts DC from the dimmer rack and the dimmers
appear to operate 0-15v (it may be 0 to -15). The PC board with the
IC on it is about 2" x 3" and has "PC279 Rev C 5Nov82" as markings on it.
The smoked IC somehow conditions the output of the master fader to drive a PNP transistor which provides a 0-15volt bus which the rest of the faders then use to drive individual dimmer channels.
Best guess at a schematic is something like below. The 8 pin IC is the question mark. It takes +18 on pin 8 and Gnd on pin 4. No -ve supply. I'm guessing something like a LM324 (but a dual instead of quad?) It's been 15 years since I dabbled much with this stuff.
Anyone care to make a guess what this IC was?
Thank you
David Meed
