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-   -   Solid state vibrators for the BC-728 (http://www.mapleleafup.net/forums/showthread.php?t=28377)

Jesse Browning 09-01-18 16:44

Solid state vibrators for the BC-728
 
The 12v is available. Is there a source for the 2 volt? Jesse.

brengunman 10-01-18 16:06

Fair Radio Sales has original (not solid state) 2 volt 7 pin vibrators.
I have bought a couple for my WS58. The original in the WS58 Power supply was a R-76C but the V06702 from Fair works.
George

Jesse Browning 10-01-18 17:31

Maybe Iíll give them a try if theyíre not too much. Iíve taken mine apart so many times over the years to clean the contacts. It just wonít work right anymore.

Chris Suslowicz 10-01-18 23:49

Quote:

Originally Posted by Jesse Browning (Post 246633)
Maybe Iíll give them a try if theyíre not too much. Iíve taken mine apart so many times over the years to clean the contacts. It just wonít work right anymore.

Solid state vibrators are difficult to impossible for anything less than about 4 volts input. (Too much voltage drop for the driver circuit to run properly, and putting an inverter in there to provide a supply for that is not really on.)

Best method for cleaning vibrator contacts is to run them from the domestic AC supply with a 25 watt light bulb (rated for the AC supply voltage) in series to limit the current.

The supply voltage (115 or 230 volts) will break through the insulating layer of crud that forms on the contacts (which the design voltage will not do) and get the vibrator started (the lamp - a proper incandescent type (Not a CFL or LED one!) is there to limit the current to a safe value. Leaving it running for a few minutes will clean the contacts quite successfully without needing to open the unit up and clean it by hand (which risks damaging the contacts and/or the reed). You may notice tha lamp brightness varies: this is a beat frequency between the vibrator reed and the AC supply frequency.

Due care (and a safety isolating transformer) is needed when doing this.

Chris.

Jesse Browning 11-01-18 14:19

Thanks Chris. I ordered some from FRS. They are cheap. Do you have a wiring diagram for the process you described? I have heard of that before. Maybe my son could hook them up for me.


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