I have been following this thread with interest, lots of good info and thanks to all that have contributed. Relative to the issue of the vibrator and possible replacements, I just stumbled across a neat motor gear box in the latest catalogue from “American Science & Surplus” ( item 49163 , $5.00) that just might work if the proper lobed cam were installed on the output shaft. The motor is 1.5 to 12 VDC draws 250 to 750mA, at 9 volts the output shaft is 75RPM, Nice compact unit 3 X 3-1/2 X 2 1/2. … output shaft is 5/16 dia.
Might be worth while checking it out if one is in need of making a replacement vibrator. Someone smarter that me will have to figure out the cam lobe design at 75 RPM to give the desired pulse frequency.
Joe B
