Pulsar Display.

[Mr Frequency 32768hz]

My good friend Juergen reminded me to change the back up batteries from my Pulsar display unit. I thought i would grab a few shots for the forum while i had it open. For some reason it has been making a loud vibrating sound when i have it plugged in. I need to check im using the correct currency convertor, or maybe the transformer is playing up.

Anyone know what this could be ?

If anyone wants ones of those NOS Compuchron's on the tabel they are super cheap at £85 each

[quietman]

Buzz = poor old transformer is wheezing a little bit. I guess your not plugging it too often so I wouldn't worry about it. Not dangerous.

(The transformer core form is made from a stack of stamped magnetic sheet metal plates. This has the coils wound round it. The alternating current makes an alternating field in the core which causes the plates to physically vibrate against each other).

[Mr Frequency 32768hz]

Buzz = poor old transformer is wheezing a little bit. I guess your not plugging it too often so I wouldn't worry about it. Not dangerous.

(The transformer core form is made from a stack of stamped magnetic sheet metal plates. This has the coils wound round it. The alternating current makes an alternating field in the core which causes the plates to physically vibrate against each other).

Many thanks for the reply. I have not plugged it in for many years. I used to have it running all the time, but once in a while the buzzing started. I always thought it might blow up, so turned it off Maybe if its not dangerous i should let it run for a while and see if the buzzing stops.

[quietman]

Leaving it running won't fix the buzzing.

On some old transformers the core stack is held together with bolts that can be tightened although I would expect most stacked cores of the size shown to be riveted. You could have a peak under the protective cover on the transformer to see if there are bolts through the laminations (MAINS OFF!! )

I'd learn to live with it.

[bruce wegmann]

If you can expose the transformer core, try using a spot applicator of Perma-Bond (or any other type of cyanoacrylate glue) to fix the core plates in position, allowing the adhesive to flow between the plates. The glue is non-conductive and has no magnetic properties, so won't interfere with normal functioning of the transformer. I'd give the adhesive a few days to fully cure and outgas, but it should solve the buzzing problem. BTW, if you ever decide you're willing to part with this gizmo, I'd be interested.

[Mr Frequency 32768hz]

If you can expose the transformer core, try using a spot applicator of Perma-Bond (or any other type of cyanoacrylate glue) to fix the core plates in position, allowing the adhesive to flow between the plates. The glue is non-conductive and has no magnetic properties, so won't interfere with normal functioning of the transformer. I'd give the adhesive a few days to fully cure and outgas, but it should solve the buzzing problem. BTW, if you ever decide you're willing to part with this gizmo, I'd be interested.

Bruce many thank for the information. I just about got the back off, so would have to take your tips to a professional.

[Kasper]

incredible shot ....can i come to the exhibition?

[azimuth_pl]

hello, is that display stand using the special factory modified module like shown here?
viewtopic.php?f=80&t=5718

how does it display the time? constantly lit or does it randomly light up time or date?
any pics?

[Mr Frequency 32768hz]

hello, is that display stand using the special factory modified module like shown here?
viewtopic.php?f=80&t=5718

how does it display the time? constantly lit or does it randomly light up time or date?
any pics?

It can be set to continuously scroll through all displays, "Time, seconds, day date". Or can be set so the customer presses the button.