Bread Board is complete. Surprisingly all worked (well had an initial issue where i wasn’t providing +5 and -5 volts properly to the board), bit of hiss in the background, but suspect this is because its on a breadboard.
(56k Resistors still arn’t here but put some in series to get the resistence needed)
29/10/2009 – RS Stuff has all turned up, but I had forgotten to add the 56K resistors to the order…3.5mm Stereo PCB jacks also turned up…but suspect they are too close to the board to accept a jack unless at end of the card..Will be fine for breadboard and prototype, but will most likely look at some that are slightly raised to allow cable to not impact back of case. (ideally i want to use a cable from the board to the the back of the case to fit in one of the ports…but finding parts seems difficult)
Connector seems to work well with the ribbon cable and though its a bit of a tight fit on the motherboard it does fit, and didn’t need any crimps. Also started the bread board…not sure its big enough, but its what i had available :).
I have been busy getting parts together for this new project and have just ordered the following parts from RS.
- 517-3181 – TL084I quad 3MHz 13V/uS op amp, DIP14
- 197-2669 – 16 way turned pin DIL socket,0.3in pitch
- 519-0316 – Dual 4-1line mux/demux,MC14052BCP DIP16
- 135-910P – RES HYSTAB 0.25W/10K
- 135-932P – CFR16 carbon film resistor,15K 0.25W
- 365-4234 – NHG min Al electrolytic cap,4.7uF 50V
- 365-4240 – NHG min Al electrolytic cap,10uF 50V
- 122-4235 – FKS2 Polyester Cap,100Vdc,1.5nF
- 622-4397 – Plastic film capacitor,100nF 63V 5%
- 157-547 – MBA0204 M/F Res, 0.4W 50PPM 1% 56K
- 289-9846 – Speedbloc(R) 10 way IDC ribbon cable,5m
- 189-9592 – HE14 AUTOCOM cable socket 26/28awg 7W
I have also ordered a selection of connectors/headers to see what will be best for connecting to the mainboard.
Andy at work likes his circuit diagrams and has kindly drawn up a schematic and a PCB layout based on the TDX diagram and Polymorphs use of the Quad Amp. He still has to add the connector layout for the GS slots, but I am well on my way to having a bread board ready for some testing.
Version 1 Schematic and PCB Layout
I am just going to be using a single sided copper board for the prototyping stage (once breadboard testing is done) this will mean that I will not have the +5V, so will plan to add a L7805 Reg to bring the +12V down to +5V. This will mean only pins 34 and 50 will be used on the connector.