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 Ferrocart & MSP/OAK Multivibrators
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 Return to top of page · Post #: 1 · Written at 12:25:35 PM on 25 November 2012.
David G Dawson's Gravatar
 Location: Cundletown, NSW
 Member since 25 March 2010
 Member #: 639
 Postcount: 26

Hello all,
Have a project going that needs a Synchronous 12v Split-Reed Multivibrator.
Have many here but not exactly as above and thinking of using two 12volt units instead but then again, they are rare at 12volt.
Looking for an MSP Oak V5948 or Ferrocart PM420 (18178) or PM357 tropical.
Would appreciate any assistance in this area and would preferably need two.
Thanks.

Smokey


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Smokey

 
 Return to top of page · Post #: 2 · Written at 1:15:44 PM on 25 November 2012.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3860

I would like to see what the vibrator is doing? Quite often they are used to produce DC and I doubt two would work as they would not syncronise.

I have an ignition coil tester with a 6V one, but they use the second switch to emulate the ignition points.

Marc


 
 Return to top of page · Post #: 3 · Written at 2:38:37 PM on 26 November 2012.
David G Dawson's Gravatar
 Location: Cundletown, NSW
 Member since 25 March 2010
 Member #: 639
 Postcount: 26

Hello Marc,
Yes, you are quite correct and I had not fully analysed the situation.
Have two Splits here, AWA which is MSP/OAK and Ferrocart where I can rewind the coil to suit a 12 volt situation and working on that now.
Ferrocart data shows the coil ohms and this is handy data to have.
Manufacturers appear to have made a base model and then changed the coils for the various voltages.
Have a local I have contacted to look out for some at the HRSA meet on 1st December so hope that may be an option.
Yesterday there was a box of about 100 going on Ebay and was pipped at the post on that lot.
Patience is needed for the 12 volt Splits to appear again on Ebay.
Thanks.

Smokey


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Smokey

 
 Return to top of page · Post #: 4 · Written at 10:38:33 PM on 26 November 2012.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3860

The laziest way to drop from 12V to 6V on the coil and avoid rewinding it, albeit it makes it polarised. Is to use diodes in series. The good thing with them, is they drop the voltage by a set ammount, irrespective of the current.

I would use HV types, as the back EMF can be quite savage, the padder capacitor is often in the order of 0.05mfd . 1KV, or more and notorious for punching through. All caps in the vibrator section are best to be HV types

Marc


 
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