Electroteach

I have a quantity of green 7 segment displays labelled bd1-561 gu-a21.
leds-7-segment-displays
The pin sequence 7,6,4,2,1,9,10,5 is the sequence of the segments A,B,C,D,E,F,G,DP.
Note that 3 and 8 are missing, they are the common 'odes (cathode or anode).

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Briefly - power in is 9V on the left most two connectors. Power input is diode protected.
Reason for mentioning this kit is that the kit is already made and can be used for testing other gadgets.
The data format is 2400/N/8/1 { RS 232 }.

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Amateur Radio mobile/temporary setup

NAND

dvt 2500

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Sometimes Grammarly is used to verify spelling and grammar. However, there are occasions when I choose my own rules.

Thu Dec 19 18:39:06 2019
Sometimes something is donated but on receipt, it appears not to work. In this example, it was a bedside radio. The manual may not be present and the item may be too old to find on the internet. So the dismantling process is started. The item may be composed of many sub-modules and some of them may be identifiable electronic sub-units such as keypads, rotary controls for volume, motors (DC or stepper) and so on.