For a whole lot of reasons, so much time has passed since I first mentioned this, I thought I'd better make it a new post. I had a lot of interest when I raised this last time so I've had 50 sets of boards made – locally, not in China!

Boards are now in and several examples have been built and tested.

I have an NC router coming this week to process the cases because the transformers currently don't allow the case to close neatly, it bulges a bit. The routing will fix that. I used a bench grinder on the ones I built – tedious and ugly!

I've sent Brad some pictures to accompany this post and also a BOM in PDF format. It has costings with your buy price, which in most cases is less than I paid – the benefit for you in the case of the boards is you're not paying for tooling.

Works out you can buy a set of boards for $4.50 or a complete kit of parts with instructions for $52. Or anything in between if that suits you better. You can see how it's costed, I'm easy. I don't see this as advertising, it's a no-profit service for collectors - I just love battery radios!

If anyone wants a Built and Tested price I guess I could do that – depends how many want it, if enough I'll get our contract assemblers to build them!

Pic 1 – Power Supply with Healing radio.

Using vias for the sockets is a neat trick.

Very nice. I'm very tempted to get a complete kit.

GTC:

Yes it works much better on this revision, I tweaked the sizes and positions a bit.
There are pads at the back for soldering extra contacts on if they are needed. They don't seem to be on the two radios I've tried so far.

Robbbert:
If you want one, email me & I'll add it to the list. Complete kits in about a week at the moment, assuming my NC router arrives on Wednesday.
If you don't like it, don't pay me! (this deal is only for forum members!)

Email sent.

Email sent

Mine turned up yesterday morning. I build one last night. Havent tried it with a radio yet, but it went together reasonably easily.
The black PCB looks good, but its a bit hard on the eyes when constructing

cheers
Ben

Waiting for it to arrive..

Hi Robbbert

You said wait until mid month before posting so it was posted today.

I would be very interested in getting a complete kit .I will need one for my AWA C54 when its finished.

I still have a few kits from the first batch.
You have my email!

Box has arrived, thanks. Won't get time to look at it (or even open it) until next week at the earliest.

Hi,

I am interested in a unit to power the AWA C48 that I have once it has been restored. I have the circuit for it and the voltages listed are:

A 4 volts (easy to know as valves are 4 volt types)

B+ 3 voltages, 135, 90 and 45 volts

C I have no idea what the voltage is for C supply as it is not mentioned in the circuit. C+ is linked to A- and B-.

Based on the above information, would the Battery Radio Supply unit be suitable to use with the above radio? I can see some of the voltages on the panels of the case however I find the A supply is 1 1/2 volts. Can this be altered? If so, I would certainly be interested in ordering one.

Thanks for the assistance.

Bushman

Yes although designed primarily for 1.5 and 2V filament radios the supply can be easily modified to suit your radio.

1.5V and 2V for the A supply is standard, there is an internal jumper for the 2 volts setting. You can modify if for 4 volts by swapping a resistor.

45 volts is available internally.

There are instructions in the assembly manual for how to make these and the bias voltage changes. A different regulator with a lower dropout voltage is recommended when setting for 4 volts - I can include one of these in the kit.

There is a limit of around 700 to 800mA on the A+ supply. I suggest you look up the filament current for the valves you have and check the total is less than this. If not, a larger transformer than will fit in the case is needed. I can help with this too.

Well I have bought three of these little units today and I can tell you that they seem very easy to assemble. I regard myself as a layman and not a tech and I find the way they are designed that they are very easy to understand. Thats the sign of great design. I met Ian today and had a very enjoyable conversation about our favourite subject "Vintage Radio"