1381
PN
2222
474
4700uF
1
1381 Voltage Trigger
PN2222 Transistor
2
1381/PN2222/Diode
3
Final Assembly
7
Main Storage Capacitor
6
Timer Capacitor
5
Find a solar cell without the circuit board on it?
Build your own “free-form” version!
You will need a PN2222 transistor, a diode, a
1381 trigger (C or E), a storage capacitor
(1000µF or higher), a timing capacitor (0.47µF
to 10µF), wire, a motor and a solarcell (solarcell
must generate 3.2V MINIMUM).
(And it’s all fit onto one easy-to-read single
instruction page!)
90°
Up
90°
Up
90° to the Side
Place the 1381 and PN2222 transistor side-by-side,
and join the inner legs with the diode as shown. Note
that the black band of the diode is on the RIGHT side.
Bridge the vertical legs of the 1381 & the PN2222 with a
wire, then cut off the excess leads. If you can bend &
solder the legs together, you won’t need a wire at all.
Solder the main capacitor so the capacitor leg
nearest
the stripe
on the capacitor body (-) is soldered to the
left leg of the PN2222, and the other leg (+) is
soldered to the middle leg of the 1381.
Install the motor by
soldering one connection
to the (+) side of the
main storage capacitor
(the lead opposite the
striped side).
Solder the other
connection to the
right leg of the
PN2222 transistor.
Mount the desired discharge timer capacitor (in this
case, 0.47µF) across the middle and right legs of the
1381. If the capacitor has polarity, connect positive
(+) to the middle leg of the 1381.
Bend the left side lead (the
output)
90° up so it points
towards you.
Bend the right side lead (the
collecter)
90° to the side.
Bend the middle lead (the
base)
90° up, so it points up
at you.
=Solder point
=Solder point
=Solder point
=Solder point
=Solder point
1381
PN
2222
1381
1381
PN
2222
PN
2222
Wire
4
1381
474
1381 closeup
1381
PN
2222
474
4700uF
The Free-Form Miller Solarengine
7
