01-02-2016, 03:21 PM
Pending checking out the audio router I've decided to go with the Invotron routers. I've designed a simple interface to interlocked pushbuttons. Using bits from the junkbox it has
4x 74LS30 8 input NAND gates (would have used HC30 or HCT30 if I'd had them) as a 16 to 4 bit encoder
3x 4051 8:1 analogue mux
1x 74HCT138 3:8 decoder
1x 4060 divider with clock osc
Plus a couple of resistor packs as pullups, some decoupler caps and not a lot else.
Drawing up the schematic properly forces me to think through the loose ends of the design as well as making it easier to assemble and to maintain afterwards. I wheeled out old fashioned Orcad for DOS and the keystrokes are slowly coming back to me. I can work faster in this than the newer Orcad for windows. When I've finished I'll convert the schematic to Orcad for Windows for ease of maintenance and printing.
4x 74LS30 8 input NAND gates (would have used HC30 or HCT30 if I'd had them) as a 16 to 4 bit encoder
3x 4051 8:1 analogue mux
1x 74HCT138 3:8 decoder
1x 4060 divider with clock osc
Plus a couple of resistor packs as pullups, some decoupler caps and not a lot else.
Drawing up the schematic properly forces me to think through the loose ends of the design as well as making it easier to assemble and to maintain afterwards. I wheeled out old fashioned Orcad for DOS and the keystrokes are slowly coming back to me. I can work faster in this than the newer Orcad for windows. When I've finished I'll convert the schematic to Orcad for Windows for ease of maintenance and printing.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
