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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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2nd Jul 2015, 1:25 pm | #1 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,738
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Blaupunkt car radio vibrator problem!
Having replaced all the paper capacitors in this radio, the vibrator refused to kick up; a slight tap on the side got it going.
The radio works but every time it was switched off it needed a tap to get it going again; this called for drastic measures, ie cut the case off. The contacts were shot. I tried cleaning them to no avail. So, does anyone know if there is a solid state vibrator available? Mick. Last edited by Mike Phelan; 2nd Jul 2015 at 3:54 pm. |
2nd Jul 2015, 1:43 pm | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,193
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Re: Blaupunt car radio vibrator problem!
This company in the US sells solid state vibrators:-
http://www.radiosforoldcars.com/vibrators.htm Base diagrams here:- http://www.radiosforoldcars.com/vibratorsbases.htm UK dealers here:- www.vintagewireless.co.uk www.radios.freeserve.co.uk Or you could make your own:- https://www.vintage-radio.net/forum/...ad.php?t=41944
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
2nd Jul 2015, 1:52 pm | #3 |
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Re: Blaupunt car radio vibrator problem!
The contact for 'vibrating' should be just closed when unpowered, this is the odd one in series with the coil. A little bending should do the trick.
This is a memory from about 40 years ago when I got a valve car radio that also didn't start. As far as I can remember most had the extra contact for vibrating some didn't, anyway the same applies for the contact connected to the coil. I have a hankering for another to play with, it is quite an achievement to get a valve radio into a standard DIN format complete with HT converter. |
2nd Jul 2015, 5:17 pm | #4 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,738
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Re: Blaupunkt car radio vibrator problem!
Thanks for the reply chaps I have cleaned the contacts and adjusted, it's on soak and working fine. I noticed when I powered down it didn't always start up, more tweaking me thinks.
It's worth a look at the USA site. Thanks, Mick. |
2nd Jul 2015, 6:04 pm | #5 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
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Re: Blaupunkt car radio vibrator problem!
I hope it works for you.
Unfortunately there comes a time when no amount of cleaning contacts and/or bending springsets will achieve reliable starting.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
2nd Jul 2015, 6:06 pm | #6 |
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Re: Blaupunkt car radio vibrator problem!
A thought... In a car there would be some vibration present to start it up anyway.
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2nd Jul 2015, 9:48 pm | #7 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
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Re: Blaupunkt car radio vibrator problem!
I had this problem something over 40 years ago. I think it was a non synchronous type, but with a couple of extra diodes it should not matter. I used a couple of OC28s with emitter resistors in a simple circuit. At the time, I knew little, so found the circuit in a book somewhere. I had to play with the emitter resistor value (around 25 to 30ohms if I remember) to get the coolest temps of the OC28s. It just worked and lasted well. I could find the circuit quite easily if you wanted it.
Les. |