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

David G4EBT · 29th Sep 2018, 10:26 am

I've had a doodle around to create a PCB layout using the digital display FM unit, based on the circuit at post #13 above, using Derek's ('coopzone') adaptation to merge the FM unit with the modulator part of the circuit of the BVWS Summer 2017 FM/AM Converter design. I've checked it carefully for errors, but that doesn't mean there aren't any, so I've added it here for interest, rather than for use at this stage.

As soon as I obtain an FM module, I'll build it and report back. (I'm not sure if the FM unit needs an aerial or has one incorporated).

Meanwhile, any feedback would be welcome.

Pic 1 is the circuit
Pic 2 is the component layout on the PCB
Pic 3 is the PCB artwork (reversed) for positive UV resist board, and a negative mask for the dry film UV process.
The positive mask can also be used with the 'iron-on' laser printer technique. If the image as shown is printed off and ironed on, it will come out the correct way around.
Pic 4 is the type of PCB terminal blocks that I'll use.

Hope that might be of interest.

29th Sep 2018, 10:26 am	#19
David G4EBT Dekatron Join Date: Feb 2003 Location: Cottingham, East Yorkshire, UK. Posts: 5,766	Re: FM to AM converter - variation on a theme! I've had a doodle around to create a PCB layout using the digital display FM unit, based on the circuit at post #13 above, using Derek's ('coopzone') adaptation to merge the FM unit with the modulator part of the circuit of the BVWS Summer 2017 FM/AM Converter design. I've checked it carefully for errors, but that doesn't mean there aren't any, so I've added it here for interest, rather than for use at this stage. As soon as I obtain an FM module, I'll build it and report back. (I'm not sure if the FM unit needs an aerial or has one incorporated). Meanwhile, any feedback would be welcome. Pic 1 is the circuit Pic 2 is the component layout on the PCB Pic 3 is the PCB artwork (reversed) for positive UV resist board, and a negative mask for the dry film UV process. The positive mask can also be used with the 'iron-on' laser printer technique. If the image as shown is printed off and ironed on, it will come out the correct way around. Pic 4 is the type of PCB terminal blocks that I'll use. Hope that might be of interest. Attached Thumbnails __________________ David. BVWS Member. G-QRP Club member 1339.