Quote:
Originally Posted by FERNSEH
Hi Bob,
in order that a three position waveband switch can be fitted in a DAC90A, modifications to the switch bracket are called for.
A very small four-pole three-way switch measuring only 28mm diameter can be fitted in the extra space made for it. See attachments.
DFWB.
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Quote:
Originally Posted by bobhowe
Hi David adaptor plates here we go . Hi RT the audio amp stage on this DAC90A there is no noise so the sound quality on FM is going to be very good will report findings as it happens
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Switching the audio is the easy part. If you want to retain MW/LW (otherwise you wouldn't need a 3 pole switch) you will need to switch the variable capacitor between the module and the set which might not be as straight forward as it seems.
Here's a rare frontal view of the DAC90A
How about mounting an extra 500pF VC for exclusive use of the module, to a shaft coupler stuck (somehow) to the shaft?
But to be honest I think there is a different simpler approach that needs to be considered.
Why not couple a potentiometer to the tuning gang and use an FM receiver with varactor / varicap diode tuning of the sort that were common 30 or 40 years ago. What does the team think?