Help identifying ferrite core transformer type?

[Chris56000]

Hi!

In trying to locate alternative parts for the Oscilloscope Clock Project, can anyone offer me any details on an Asian Ferrite Transformer Core that has 7 pins each side of the bobbin on 0.15" (3.81 mm) centres please?

The transformer is a horizontal mounted type called T–SC–1, with pins on 0.15" centres – I thought it might be ETD29 or ETD34 but these are 5mm pin spacing and the PCB would have to be quite a bit bigger!

Chris Williams

[TimNJ]

A picture is worth a thousand words. Do you have one?

[Chris56000]

Hi!

One shown below!

I worked out the pin spacing by copying the two pictures of the PCBs provided by the initial eBay seller of these kits into my Sprint Layout software, which will zoom/align the picture to align with the grid, so by adjusting the zoom factor so the i.c. pin spacing is correct for the grid, the pin spacing and approximate size of the transformer can be estimated!

Unfortunately this is all I've been able to find about these kits myself, with the exception of some circuit details, parts lists and code from a very kind EEV Blog Forum Member yesterday, there's been no writeups I can find other than the SC200 one, and the write-up  that was available gave no details of the transformer design whatsoever, not even a picture!

I did try emailing David Forbes who designed it but have had no reply as of yet!

I have ordered what appears to be one of the very last of these kits from China – the money has been collected but no news of despatch as of yet!

If the seller comes back later with "no stock!", then my aim is to work out the design of a transformer for 9–16V operation which will provide the equivalent outputs to the Chinese or David Forbes's design that can be written up in full so any Members who'd like to try making their own have all they need – we now have the schematics, parts–lists and code for both the Chinese and the SC200 designs, the only missing pieces of the jigsaw are the PCBs, which I can design, and the transformer itself!

Chris Williams