I noted this morning AliExpress is selling a programmable ADF synth board with LCD readout for under 10 GBP. Needless to say this bargain is not deliverable to UK.
So as ever one checks the other sauce, Banggood. They have it there VAT paid. £19.26 inc. shipping at todays exchange rate. The pcb is different again to those we have become used to using however as you get a complete generator for not a lot more than the last black board I purchased I thought it worth a punt especially as I am get lazy to build these things. Just ordered one from Banggood so unable to give a revue at this time but thouight it worth passing on the find for others also feeling build lazy.
AliExpress also do the same unit different supplier costing more than Banggood.
I am not seeing an explanation for the use of the USB socket. On board ref frequency I have not seen either. Stability might be suspect using the on board ref but could be a useful toy for ones experiments box.
If you check AliExpress as well as Banggood more pictures are shown with the board in more detail.
I have not had any difficulties buying from Banggood. Its always worth comparing Bangood with AliExpress for price and sometimes items are ready to be shipped from UK but not this time. Both suppliers can be cheaper than ePay at times.
73s John G8ACE