UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 10M FM

SiriusHardware · 19th Nov 2018, 8:48 pm

...and the Yaesu FT290, etc, none of which displayed more than the important part of the frequency.

I have some small PCBs which have 5 * mini 7-segment LEDs and a serially accessed MAX...something or other LED driver IC on them, perfect for that sort of project. I had intended to state the IC part number but of course I can not find them just now.

As the missing first digit would always say '2' anyway, there seems little to stop you from adding a fifth display and just hardwiring it for digit '2', although you'd have to experiment with a pot to find the right segment series resistor value to get the segment brightness the same as the four existing (presumably multiplexed) displays.

19th Nov 2018, 8:48 pm	#20
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,570	Re: 10M FM - any activity these days? ...and the Yaesu FT290, etc, none of which displayed more than the important part of the frequency. I have some small PCBs which have 5 * mini 7-segment LEDs and a serially accessed MAX...something or other LED driver IC on them, perfect for that sort of project. I had intended to state the IC part number but of course I can not find them just now. As the missing first digit would always say '2' anyway, there seems little to stop you from adding a fifth display and just hardwiring it for digit '2', although you'd have to experiment with a pot to find the right segment series resistor value to get the segment brightness the same as the four existing (presumably multiplexed) displays.