UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - FM to AM converter

coopzone · 30th Sep 2018, 8:45 am

I am glad to see people interested in this. I have been continuing to experiment with the idea and also tried a variation on the mini mod 2 circuit. Attached is a beta version of the circuit, it's more or less a cross between the original mini mod and the later FM/AM converter.

This version seems to work very well to. It has a little better output stage especially if you use the transformer version. I did find that it appears to introduce a slight hum - even when running fro battery. Not quite worked out why yet - having said that it's not particularly notable.

I'm definitely going to use the PCB layout and thanks.

Derek

30th Sep 2018, 8:45 am	#24
coopzone Hexode Join Date: Jan 2018 Location: Cannock, Staffordshire, UK. Posts: 268	Re: FM to AM converter - variation on a theme! I am glad to see people interested in this. I have been continuing to experiment with the idea and also tried a variation on the mini mod 2 circuit. Attached is a beta version of the circuit, it's more or less a cross between the original mini mod and the later FM/AM converter. This version seems to work very well to. It has a little better output stage especially if you use the transformer version. I did find that it appears to introduce a slight hum - even when running fro battery. Not quite worked out why yet - having said that it's not particularly notable. I'm definitely going to use the PCB layout and thanks. Derek Attached Thumbnails