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If you’re using this trick and like to be extra careful, just solder two diagonal leads for
each relay. That let’s you flip the PCB to inspect that all the relays are flat to the board.
After that, you can finish soldering all the relay pins. Be careful to get all the relay pins!
Install the Transistors
Insert each transistor into the board, making sure that the shape of the transistor follows
the silk-screen outline on the PCB. Here’s an easy way to do it.
1.
Cut the transistors leads close to the tape. This leaves them as long as possible
without having to deal with the adhesive from the tape.
2.
Insert the ten transistors into the PCB.
3.
Place and hold a piece of cardboard over the PCB, then flip the cardboard and
PCB in one smooth motion.
4.
The transistors will fall down, but their height above the board is nicely set by the
heights of components already installed on the board.
5.
Make sure that the transistor leads are straight up and down, then solder all the
transistor leads.
Designation Value
Description
Done
Q1
MPS-A06
NPN transistor, T0-92 package
Q2
MPS-A06
NPN transistor, T0-92 package
Q3
MPS-A06
NPN transistor, T0-92 package
Q4
MPS-A06
NPN transistor, T0-92 package
Q5
MPS-A06
NPN transistor, T0-92 package
Q6
MPS-A06
NPN transistor, T0-92 package
Q7
MPS-A06
NPN transistor, T0-92 package
Q8
MPS-A06
NPN transistor, T0-92 package
Q9
MPS-A06
NPN transistor, T0-92 package
Q10
MPS-A06
NPN transistor, T0-92 package
Install the Tall Film Capacitors
Designation Value
Description
Done
C12
1 µF
Film capacitor, marked 1J63 on top
C13
1 µF
Film capacitor
C14
1 µF
Film capacitor
C15
1 µF
Film capacitor
C16
1 µF
Film capacitor
C17
1 µF
Film capacitor
Install the electrolytic capacitor
Watch the polarity. Make sure that the side of the capacitor with the negative sign is
away
from the silk screen with the positive sign.
Designation Value
Description
Done
C30
47 µF
Electrolytic, 50 V, watch the polarity!
