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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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one for the radio hams??? 40 way CB channel switch pinout
In message , Gazz writes
I have taken the 40 way channel selector switch out of an old CB radio, and want to see if i can figure out how it works, with a view of using it on my computer (i need 10 switch detents over a 90 degree arc for a control lever, hence the 40 switch detents over 360 degrees of the CB switch gives me what i want when i use a quarter of a turn on it) The switch is made by uniden, and has the following markings on it... SR-334, P-79 2-5A, they are stamped in, the UNIDEN word is cast in the back plate as well as 'PSS-23' i apeers to be made up of 4 x wafers, each individual wafer has 5 pins, and they are stacked front to back, i.e. there's room for 6 pins, but one is missing giving 2 space 3 pins, then the next wafer is 3 space 2 pins and repeat. that gives a total of 20 pins, i'm going to play with the multimeter on it, but wondered if anyone knew how they work internaly, i need to make it work like a 2 bit gray scale rotary encoder, know how to do that with a single pole rotary switch where there's an obvious 1 common pin and the switched pins (uses a few diodes to give the A, B, AB, 0, A, B AB etc output) but can i do that with this switch? In the 1980s, I modified a few UK CB sets for use at the top end of the amateur 10m band. Most designs used a limited variety of dedicated synthesiser ICs - the LC7317 being a typical example (the intention being to make it difficult to move them off the original CB frequencies), and the channel was selected by a binary coded decimal address. The channel selection switch was designed to provide the appropriate address directly. However, I don't really have any immediate access to any further useful information. -- Ian |
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