Hi. Total beginner to the forum. I'm getting back in to electronics as a hobby after many years away.
I was given an "old" (I have no idea of the actual year of manufacture but it looks like the board design might be from 1994?) kit for a quiz buzzer.
Unfortunately, although it appears to have all the components, the circuit diagram/assembly instructions have been lost over the years.
The kit uses a ULN2803A transistor array, one HCF4098BE (Google says this is a monostable multi-vibrator) and two HCF4043BE (QUAD NOR 3-STATE R-S LATCHES).
Does anyone have any idea where I might track down the circuit diagram for this, before I have to start trying to reverse engineer it? I've contacted Maplin but, unsurprisingly they don't have access to this kind of info from the old company.
Any help most gratefully received.
Matt
I was given an "old" (I have no idea of the actual year of manufacture but it looks like the board design might be from 1994?) kit for a quiz buzzer.
Unfortunately, although it appears to have all the components, the circuit diagram/assembly instructions have been lost over the years.
The kit uses a ULN2803A transistor array, one HCF4098BE (Google says this is a monostable multi-vibrator) and two HCF4043BE (QUAD NOR 3-STATE R-S LATCHES).
Does anyone have any idea where I might track down the circuit diagram for this, before I have to start trying to reverse engineer it? I've contacted Maplin but, unsurprisingly they don't have access to this kind of info from the old company.
Any help most gratefully received.
Matt