Capacitors
22pF low-K ceramic 2.5mm
C4
330p low-K ceramic 2.5mm
C5
100nF axial multilayer ceramic
C1, C2, C9
10uF, 35V electrolytic
C3, C6, C10, C11
22uF, 35V electrolytic
C12
470uF, 35V electrolytic
C15
1800uF, 35V electrolytic
C7, C8, C13, C14
Note: C7, C8, C13 and C14 are 105 degree Celsius radial types and have standard wire ended
leads. Lead spacing is 7.5mm. I recommend Panasonic type EEUFC1V182 but any decent 105
degree part can be used that will fit on the board will do.
Alternatively, you can use two 3300uF, 35V instead. Fit these to positions C8 and C14 and
leave C7 and C13 empty.
Integrated Circuits
7805 5V 1A regulator
U1
LM723CN 100mA voltage regulator
U2
OP177GPZ single precision op-amp
U3
Good quality DIL sockets are recommended. You need one 14-pin and one 8-pin.
Discrete Semiconductors
1N4004 rectifier diode
D1, D2, D3, D4, D5, D6, D7, D8
1N5401 rectifier diode
D9, D10, D11, D12
TIP35C NPN transistor
Q1
TIP145 or TIP147 PNP Darlington transistor
Q2
BC560 PNP transistor
Q3
Do not solder the Q1 or Q2 until the board is mounted on its panel
For D1 to D8 you can use any other 1N400X part such as 1N4001, 1N4002, etc.
D9 and D10 do not need to be fitted if you are using a single phase wall wart or line lump.
However, for full wave rectification D9 and D10 are required. So if you are using a split
output line lump, or an internal transformer with twin secondaries, D9 and D10 have to be
fitted.
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