1- BUTTON version PCB assembly - Bag1

[Tony]

Fit the yellow plastic .22u capacitors x5 in locations marked for C9,10,11,12 and 13 as shown:

[Tony]

Fit the 5x 24k (red yellow orange) resistors in places R27, 32,33,35 and 36:

[Tony]

Now assemble the nixie tube sockets.

Using wirecutters or pliers carefully break the turned pin sockets out of the plastic housing:



Push the pins into the bakelite or MDF holder:



When completed, drop them into the V1-5 positions on the PCB and solder them in place.

Now fit the blue 3mm LEDs through the centre hole so they sit on top of the socket. NOTE that these are polarised and must be fitted the right way round. The SHORT PIN faces to the LEFT of the PCB when viewed from the front.

[Tony]

Fit the black plastic transistors x5 marked 'MPSA92' or '2N6520**' in locations marked for T1,3,5,7 and 9 as shown: NOTE these are polarised and must be fitted the right way round. There is a flat mark on one side of the body, this flat side faces to the LEFT of the PCB when viewed as shown in the photograph.

[Tony]

Fit the black plastic transistors marked 'MPSA42' or 'KSP42' in locations marked for T2,4,6,8,10 and 11 as shown: NOTE these are polarised and must be fitted the right way round. There is a flat mark on one side of the body, this flat side faces to the RIGHT of the PCB when viewed as shown in the photograph.

[Tony]

Fit the green resin 4n7 capacitor in the location marked for C7 as shown:

[Tony]

Fit the aluminium can 3.3u 200/250V capacitor in the location marked for C6 as shown - the white bar on the side of the capacitor indicated the negative- terminal and faces to the *right*:

[Tony]

Fit the green aluminium can 330 or 470u capacitor in the location marked for C8 as shown: NOTE this is polarised, the negative- terminal is marked with a white band. This faces towards the BACK/TOP of the PCB when viewed as shown. Try and leave enough room on the right of it for R13 to be fitted.

[Tony]

Carefully fit the USB socket, it may be a little tight but don't push too much or you may damage the pins. Fit the 3.5mm jack socket marked SK2:

[Tony]

Now the buzzer LS1 to fit. Note the + faces UP on the PCB markings: