Can you tell me what this is?

[CVA59]

I recently acquired a bunch of old school R/C stuff from an old builder and flyer. In the stuff I found 2-3 of these and I'm really not sure what they are or their function. Do you guys have any ideas?

[Hoomi]

With the LED board attached, it almost looks like a light control circuit, but it also looks far more complicated than it would need to be for that function, even for "old school."

[CVA59]

With the LED board attached, it almost looks like a light control circuit, but it also looks far more complicated than it would need to be for that function, even for "old school."

It has me puzzled. It almost looks like something homemade.

[fhhuber]

LM339N voltage comparitor

H9345 lists as a stepper motor control chip

Can't read the others but I would expect it to be something on the lines of a gear sequencer or an ESC for brushed motor. The number of plugs makes me think its a gear control, possibly the old Kraft electric retracts controller.

*****************

Found the old Kraft retracts... won't be that. This board is too large.

[CVA59]

Here's a few more.

[Skyboom]

2nd pic in your 1st post reminds me of a machine gun sound board. The switch is operated from a servo installed somewhere in the plane. Again this is just speculation.

[Hoomi]

2nd pic in your 1st post reminds me of a machine gun sound board. The switch is operated from a servo installed somewhere in the plane. Again this is just speculation.

Hmmm... if the LED's are wired to flash in sync with the sound, that would make sense.