Star Tech Journal

Issue: 1981-September - Vol 3 Issue 7

PHILADELPHIA
VENDING
SERVICE
215-698-2738
********
• Ace Locks Rekeyed $1.00·
• Ace Keys
$1 .00
• American H-10 Padlocks
As Low As $7.00 each
********
We carry a complete line of
American padlocks. We also
carry all of the game speed-
up kits at low prices.
For further information please
call or write:
Philadelphia
Vending
Service
8810 Dewees St.
Phila., PA 19152
********
V*'S
S*A*L*L*u \ z
T E C ~PARl 21 Q , , NEW
OUEsnoNs
T:
FOR EV.
·by
Edwa;f HN/CfANs 'ALUATING
J. Schmidt
6. What is the Voltage gain of the given Circuit?
/?:2
1?4
(!2.
.,()Ci,2.p,e
300..a..
5t)OJZ.
1
C2 .,(l~;V/:1
{
1?6
/~"(;
T
~
o----1
/?I
I00....12-
=
A. 5
B. 10
C. Can't be computed
from info given.
D. 1
E. None of the above.
••••••••••••••
7. A Bridge Rectifier converts, _ _ _ _ _ _ to, _ _ _ _ _ _
A. Resistance to lmpedence
B. AMP to Micro Amps
C. Voltage to Circuit
D.AC to DC
8. Draw the Output Waveform of a full Wave Bridge.
M
u
R
p
H
y
9. Define a Micro Processor.
s '
L
A
10. What are the below listed Gates?
w
#
3
0
7
'f.~\
=[>- =D- =D-- --{>-
A. or, and, nand, inverter
B. nand, nor, or, exclusive or
C. J.K., Rs, nand, and
D. inverter, nand, nor, or
ANSWERS TO BALLY'S TECH QUIZ (PART 2) NEXT MONTH.
TEST
1. A NPN
ANSWERS
2. B POS
4. C 1 Volt
(PART
1)
3. D Current, A. Resistance
5. D 5
S•TJ SEPTEMBER 1981 5
Modification of One Coin-One Play Machine
Into Two Coin-One Play Machine
byAsraphAII
Single coin operated machine can be modified into two coin operated machine
using Flip-Flops. The fig-1 shows micro-switch connections of the coin
mechanism. The modified circuit for two coins is shown in fig-2.
The flip-flops are used for dividing action. In addition, the
circuit uses a miniature relay which has two normally open
contacts. The first one supplies coin pulse to the machine
and the other one resets the flip-flops immediately
after the coin pulse is supplied.

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