012-01231C
2
➂
Connect the Laser Switch stereo phone plug to a PASC0
Photogate Timer, Counter/Timer/Frequency Meter, or
Computer Interface. Interrupt the beam manually to
check that the timer changes state (starts or stops) as the
interruption occurs.
If other than a PASCO Timer or Computer Interface is
used, see the schematic for proper power and signal
connections.
➄
Use a stereo phone plug extension cord (PASC0 Model
PI-8117) for increased separation between the photogate
and the timer.
Specifications
Detector Rise Time: 150 nanoseconds
Output States: High when detector is illuminated
Low when detector is not illuminated
TTL and CMOS compatible.
Power Requirements: 5 VDC at 45 mA
GROUND
OUTPUT
+5VDC
Stereo Phone Plug
2
6
TH
TR
VCC
DIS
8
7
3
OUT
GND
R
CV
U1
555
R1
10K
Ω
R2
220
Ω
R3
390
Ω
Q1
MRD-3050
1
4
5
N/C
N/C
R4
82
Ω
Q2
2N3906
LED1
(GRN)
+5V
OUT
GND
SCHEMATIC
Q1
R1
Q1
R3
R2
R4
TAB
Q2
+
-
o
E
C
B
Component Layout
Notes:
➀
All Resistors are 1/8W, +/- 5%
➁
Output LED
Light=1 ON
Dark=0 OFF
Limited Warranty
PASCO scientific warrants this product to be free from
defects in materials and workmanship for a period of one
year from the date of shipment to the customer. PASCO
will repair or replace, at its option, any part of the product
which is deemed to be defective in material or workman-
ship. This warranty does not cover damage to the product
caused by abuse or improper use. Determination of whether
a product failure is the result of a manufacturing defect or
improper use by the customer shall be made solely by
PASCO scientific. Responsibility for the return of equip-
ment for warranty repair belongs to the customer. Equip-
ment must be properly packed to prevent damage and
shipped postage or freight prepaid. (Damage caused by
improper packing of the equipment for return shipment will
not be covered by the warranty.) Shipping costs for
returning the equipment, after repair, will be paid by
PASCO scientific.
Equipment Return
Should this product have to be returned to PASCO scien-
tific, for whatever reason, notify PASCO scientific by letter
or phone BEFORE returning the product. Upon notifica-
tion, the return authorization and shipping instructions will
be promptly issued.
NOTE: NO EQUIPMENT WILL BE ACCEPTED
FOR RETURN WITHOUT AN AUTHORIZATION.
When returning equipment for repair, the units must be
packed properly. Carriers will not accept responsibility for
damage caused by improper packing. To be certain the unit
will not be damaged in shipment, observe the following
rules:
➀
The carton must be strong enough for the item shipped.
➁
Make certain there is at least two inches of packing
material between any point on the apparatus and the
inside walls of the carton.
➂
Make certain that the packing material can not shift in
the box, or become compressed, thus letting the
instrument come in contact with the edge of the box.
Output:
Source = 40mA @ 4.9V
Sink = 20mA @ .2V
➃
