Just put a AA or smaller NiCd in a socket, attach that to chassis, and solder the wires where the old cell was installed.
Must be roomy enough, that tuner.
Coin size NiCd were made by Varta long back, and my old Ericsson GH688 had one, with solder tags.
May be available even now.
Must be roomy enough, that tuner.
Coin size NiCd were made by Varta long back, and my old Ericsson GH688 had one, with solder tags.
May be available even now.
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I have no ties to the sellers, and a search for 'coin type NiCd cell' gets quite a few results.
These are quite common in PLCs to store the parameter settings.
Your choice.
These are quite common in PLCs to store the parameter settings.
Your choice.
The memory could retain its settings down to quite a low voltage although in normal operation the rail looks to be 9 volt as it is tied via that diode (top left in image) to a rail.
Looks like the charging circuit is just half wave of the transformer which in turn looks to be about 20 volt peak give or take. So about 12ma peak charging current. That 1.5k could be a typical failure item if it is just a small 0.25 or 0.5 watt. Worth checking.
Going back to the 80's it was common to see single 1.2v cells in some Philips TV's. They were a major failure item. I have a (vintage) Philips dating back to the 80's that also had one of these and about 15 years ago I replaced it with a 3v lithium coin cell and series diode along with 'snipping' the charging resistor out of circuit. It is still going strong :}
the NiCD batteries from Amazon arrived today, they look fresh, mint, and legit.
ran 4 of them through testing by my Opus charger and they all did acceptably well
ran 4 of them through testing by my Opus charger and they all did acceptably well
I mean it's a battery backup in a radio. Even a piece of marde would work fine in such a low drain circuit, right? 🙂
I would install a socket/holder if you can though. If you do try to solder directly to a NiCD, do it outside and wear a respirator in case it ruptures. Cadmium is pretty toxic.
If you're lucky, this holder has the same footprint as the old battery!
https://www.pcboard.ca/aa-battery-hold-pcb-mount
I would install a socket/holder if you can though. If you do try to solder directly to a NiCD, do it outside and wear a respirator in case it ruptures. Cadmium is pretty toxic.
If you're lucky, this holder has the same footprint as the old battery!
https://www.pcboard.ca/aa-battery-hold-pcb-mount
You do get batteries with solder tags, and also with flying leads (wires), easier than soldering to a battery case.
Use abrasive if you really have to solder to a battery, remember you risk damaging gaskets because of heat. That may cause a leak in the future.
Also +1 on safety precautions.
Use abrasive if you really have to solder to a battery, remember you risk damaging gaskets because of heat. That may cause a leak in the future.
Also +1 on safety precautions.