Alt-BEAM Archive
Message #13455
To: beam@sgiblab.sgi.com
From: "Gary Fuqua" beam@sgiblab.sgi.com
Date: Sat, 15 Apr 2000 21:31:15 -0500
Subject: Is this solar engine working? Something doesn't seem right
I breadboarded a 1381 solar engine using the following components:
1381 Voltage detector - J flavor
3906 Transistor
3904 Transistor
Panasonic BP-373334 Solar Panel
2200 uf 10v Capacitor
2.2k ohm 1/4 watt resisitor
small pager motor from All Electronics
The circuit, when exposed to full sun or 100 W light bulb, turns the =
pager motor slowly, but consistently. Is this how it should work? I =
was expecting this circuit to turn the motor in higher torque "spurts". =
When I pull the 1381 out of the circuit, let the cap charge and put the =
1381 back in, the motor does spin about 4 or 5 revolutions with higher =
torque. This is similar to how the motor spins when connected to just =
the full charged cap. Once the voltage in the circuit drops to 2.69V =
the motor then resumes its slow pulsing rotation. The voltage at =
the motor never seems to get above .05 V.
Another observation is that removing the 3906 out the circuit doesn't =
seem to affect the operation. The circuit still turns the motor very =
slowly when exposed to bright light.
http-equiv=3DContent-Type>
higher torque "spurts".
When I pull the 1381 out of the =
circuit, let the=20
cap charge and put the 1381 back in, the motor does spin about 4 or 5=20
revolutions with higher torque. This is similar to how the =
motor=20
spins when connected to just the full charged cap. Once the =
voltage=20
in the circuit drops to 2.69V the mo
size=3D2>tor then=20
resumes its slow pulsing rotation. The =
voltage at=20
the motor never seems to get above .05 V.
Another observation is that removing =
the 3906 out=20
the circuit doesn't seem to affect the operation. The circuit =
still=20
turns the motor very slowly when exposed to bright light.
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