Wow, nice find. That looks perfect in that shadow box. I wonder if there is enough voltage headroom with using the 9vac power adapter and expecting the 7812 to work as intended....not that this circuit needs a tightly regulated supply tho. Cool. Enjoy!
I found a stack of single digit led boards in trash near a bingo place. They use the same layout of red leds for 7 seg digits and controlled by 50-Logic series. There was a controller board with them but no way of knowing how to use it but I can inject binary into the digits to make numbers and I was going to make a clock out of them lol I think they were the prize board at some time as there is also a £ symbol and a P. There is a black front cover on them that the LEDS just poke through. This thing you have looks very similar so maybe same era :D Nice find :D It looks hand made, as in, we used to make pcbs like that in electronics workshop in the 1990's on my YTS scheme! :D
Thanks! It sounds like you could make quite a clock out of those boards, though if they are each as big as this single board, you will need quite a big case. The PCB is single-sided, and if not for the stamped 1 in a triangle on the back, I would guess it had been homemade. It may well have been made in a small shop though.
@@50sTransistorRadios Your board may have been a project from a magazine or indeed purpose built. I found the boards of mine just now in the attic lol. The boards of mine are built by a ECM Systems and stamped 9-6-88. A quick look on google does indeed label them as Bingo and Entertainment equipment suppliers! It looks like the boards were designed to run off 24 volt with a power plug and interface on the back which is just a 14 pin IC socket. The pins are labelled AC(T)AC(U)BD(T)BD(U) GND suggesting BCD input to 2 independent digits. The other ICs are all DIL or SIL resistor packages, a voltage regulator, a few caps, a fuse and 2 TC4511BP chips. The led layout is identical to yours with 5 leds per segment but maybe only about 3-4 inches in digit length and about 2 inches wide with the board only being slightly bigger. Id say total size including black wood cover with holes in is about 7inch wide by maybe 5 long. I still have the divider/oscillator to make 1 sec pulse on a breadboard, all the logic AND gate chips, Binary counter chips, practically everything to make it work but just never got round to doing it lol. All the leds are squashed so I need to carefully straighten them out one day and maybe finish it. Your device is very interesting as the MM518N is designed to display a clock on a TV screen in conjunction with an MM5841 chip! :D so some serious weirdness is going on to display a single digit clock like that :D I just love the old way of doing things, you learn a lot more about circuit design, logic and control by DOING rather than just sticking in a PIC or Arduino and copying someone else's code, no fun at all! Very nice board and I'm glad you got it working, should last for years!
Wow, nice find. That looks perfect in that shadow box. I wonder if there is enough voltage headroom with using the 9vac power adapter and expecting the 7812 to work as intended....not that this circuit needs a tightly regulated supply tho. Cool. Enjoy!
Now that’s interesting!
Thanks!
I found a stack of single digit led boards in trash near a bingo place. They use the same layout of red leds for 7 seg digits and controlled by 50-Logic series. There was a controller board with them but no way of knowing how to use it but I can inject binary into the digits to make numbers and I was going to make a clock out of them lol I think they were the prize board at some time as there is also a £ symbol and a P. There is a black front cover on them that the LEDS just poke through.
This thing you have looks very similar so maybe same era :D Nice find :D
It looks hand made, as in, we used to make pcbs like that in electronics workshop in the 1990's on my YTS scheme! :D
Thanks! It sounds like you could make quite a clock out of those boards, though if they are each as big as this single board, you will need quite a big case.
The PCB is single-sided, and if not for the stamped 1 in a triangle on the back, I would guess it had been homemade. It may well have been made in a small shop though.
@@50sTransistorRadios Your board may have been a project from a magazine or indeed purpose built. I found the boards of mine just now in the attic lol. The boards of mine are built by a ECM Systems and stamped 9-6-88. A quick look on google does indeed label them as Bingo and Entertainment equipment suppliers! It looks like the boards were designed to run off 24 volt with a power plug and interface on the back which is just a 14 pin IC socket. The pins are labelled AC(T)AC(U)BD(T)BD(U) GND suggesting BCD input to 2 independent digits. The other ICs are all DIL or SIL resistor packages, a voltage regulator, a few caps, a fuse and 2 TC4511BP chips. The led layout is identical to yours with 5 leds per segment but maybe only about 3-4 inches in digit length and about 2 inches wide with the board only being slightly bigger. Id say total size including black wood cover with holes in is about 7inch wide by maybe 5 long. I still have the divider/oscillator to make 1 sec pulse on a breadboard, all the logic AND gate chips, Binary counter chips, practically everything to make it work but just never got round to doing it lol. All the leds are squashed so I need to carefully straighten them out one day and maybe finish it.
Your device is very interesting as the MM518N is designed to display a clock on a TV screen in conjunction with an MM5841 chip! :D so some serious weirdness is going on to display a single digit clock like that :D
I just love the old way of doing things, you learn a lot more about circuit design, logic and control by DOING rather than just sticking in a PIC or Arduino and copying someone else's code, no fun at all!
Very nice board and I'm glad you got it working, should last for years!
RCA was the inventor of 4000 series logic. But they haven't made ICs for decades. That RCA labeled CD4051 has to be original.
Yes, the CD4051 is likely original. The CD4040BE with the 1996 date code is the one I'm pretty sure is a replacement.