Alt-BEAM Archive

Message #13467



To: beam@sgiblab.sgi.com
From: owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On
Date: Sun, 16 Apr 2000 11:51:42 +0200
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>

class=3D140255009-16042000> -----Original =
Message-----
From:=20
owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On =
Behalf Of=20
Gary Fuqua
Sent: Sunday, April 16, 2000 4:31 =
AM
To:=20
beam@sgiblab.sgi.com
Subject: Is this solar engine working? =
Something=20
doesn't seem right


style=3D"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px">
I breadboarded a 1381 solar engine =
using the=20
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=20
Electronics

 

The circuit, when exposed to full sun =
or 100 W=20
light bulb, turns the pager motor slowly, but consistently.  Is =
this how=20
it should work?  I was expecting this circuit to turn =
the motor=20
in 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=20
voltage in the circuit drops to 2.69V the mo size=3D2>tor=20
then resumes its slow pulsing rotation.      =
The=20
voltage at 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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