Star Tech Journal
Issue: 1987-July - Vol 9 Issue 5 - Page 13
STAR*TECH Journal
BILATERAL TRIGGER DIACS
GENERAL DESCRIPTION:
The diac semiconductor is a full-wave or bi-
directional thyristor. It is triggered from a
blocking-to-conduction state for either polarity
of applied voltage whenever the amplitude of
applied voltage exceeds the breakover voltage
rating of the diac.
LIA!)
IJ~TI>
I Sa•
r
w
1'1tl~
IU, "AC.
Figure 1 is from the DIGI-KEY catalog,
page 37, and shows a "Diac-Triac Full-Wave
Phase Control Circuit." As Eugene points
out, this circuit is inexpensive and easy
to build. However, this circuit is
generally used as a "test circuit" and
only under resistive loads.
July ·1987 [13)
TRDUBLESHDOTINB ELECTROHONE
& WELLS &ARDNER MONITORS
A troubleshooting manual covering the
servicing of the most popular color video
monitors used in the Coin-Operated
Amusement Industry, has Just been
published by STAR*TECH JOURNAL.
Thia very thorough and detailed manual
covers every ~spect of monitor repair
including: Power Supply Section - symptoms
and solutions. CRT Construction and
Operation -brightness problems and
solutions. Deflection Circuitry -sync
circuit description end troubleshooting.
Color Problems -including degaussing,
purity, white balance and convergence
adjustments.
Troubleshooting Electrohome & Wells
Gardner Monitors is priced at $19.95 [US)
plus $2.50 shipping.
Distributed by STAR*TECH JOURNAL.
POB 1065, Merchantville, NJ 08109.
~In a BIG CHOICE crane, this circuit would
experience both resistive and inductive
load which would further limit the phase
control ability of the circuit.
For operators, which way to go still
remains a "BIG CHOICE"!
CRANE MERCHANDISE
,,,&es,
-
DIFFERENT • ONIQOE • EXCITING
IMMEDIATE DELIVERY
SAMPLE COPIES of STAR*TECH JOURNAL for
your next State Association meeting are
available. Just send us your requirements
such as: Date needed, quantity, mailing
address and to wham's attention. Send
requests to: STAR*TECH JOURNAL, PO Box
1065, Merchantville, NJ 081D9.
VOLUMES/ISSUES
Some back issues and complete volumes
remain in our inventory. Complete Volumes:
$42 [$US). Sing le Issues: $5 [$US).
*** Send self-addressed stamped [$D.39)
envelope [11D or larger) for complete
index of all articles covered since Mar79.
Availability: Complete Volumes [twelve
issues bound under one cover)s
11 [Mar79-FebBO),
12 [MarBD-FebB1),
13 [MarB1-FebB2),
14 [Mar82-Feb83).
*********••·······························
ISSUE PACKAGES O $42 [US).
Pkgf581 MayB4, JunB4, Jul84, Aug84,
\
Call Toll Free:
(800) 992-2388, (800) 992-6577 (in California)
1590 Sunland Lane, Costa Mesa, CA 92626
Nov/Dec84, Jun85, Jul85, AugB5,
Sep85, OctB5, Novas, DecB5,
pkgf781 JanBB, FebBB, MarBB, AprBB,
Mayes, JunBB, JulBB, AugBB,
SspBB, OctBB, Nov86, DecBB,
BILATERAL TRIGGER DIACS
GENERAL DESCRIPTION:
The diac semiconductor is a full-wave or bi-
directional thyristor. It is triggered from a
blocking-to-conduction state for either polarity
of applied voltage whenever the amplitude of
applied voltage exceeds the breakover voltage
rating of the diac.
LIA!)
IJ~TI>
I Sa•
r
w
1'1tl~
IU, "AC.
Figure 1 is from the DIGI-KEY catalog,
page 37, and shows a "Diac-Triac Full-Wave
Phase Control Circuit." As Eugene points
out, this circuit is inexpensive and easy
to build. However, this circuit is
generally used as a "test circuit" and
only under resistive loads.
July ·1987 [13)
TRDUBLESHDOTINB ELECTROHONE
& WELLS &ARDNER MONITORS
A troubleshooting manual covering the
servicing of the most popular color video
monitors used in the Coin-Operated
Amusement Industry, has Just been
published by STAR*TECH JOURNAL.
Thia very thorough and detailed manual
covers every ~spect of monitor repair
including: Power Supply Section - symptoms
and solutions. CRT Construction and
Operation -brightness problems and
solutions. Deflection Circuitry -sync
circuit description end troubleshooting.
Color Problems -including degaussing,
purity, white balance and convergence
adjustments.
Troubleshooting Electrohome & Wells
Gardner Monitors is priced at $19.95 [US)
plus $2.50 shipping.
Distributed by STAR*TECH JOURNAL.
POB 1065, Merchantville, NJ 08109.
~In a BIG CHOICE crane, this circuit would
experience both resistive and inductive
load which would further limit the phase
control ability of the circuit.
For operators, which way to go still
remains a "BIG CHOICE"!
CRANE MERCHANDISE
,,,&es,
-
DIFFERENT • ONIQOE • EXCITING
IMMEDIATE DELIVERY
SAMPLE COPIES of STAR*TECH JOURNAL for
your next State Association meeting are
available. Just send us your requirements
such as: Date needed, quantity, mailing
address and to wham's attention. Send
requests to: STAR*TECH JOURNAL, PO Box
1065, Merchantville, NJ 081D9.
VOLUMES/ISSUES
Some back issues and complete volumes
remain in our inventory. Complete Volumes:
$42 [$US). Sing le Issues: $5 [$US).
*** Send self-addressed stamped [$D.39)
envelope [11D or larger) for complete
index of all articles covered since Mar79.
Availability: Complete Volumes [twelve
issues bound under one cover)s
11 [Mar79-FebBO),
12 [MarBD-FebB1),
13 [MarB1-FebB2),
14 [Mar82-Feb83).
*********••·······························
ISSUE PACKAGES O $42 [US).
Pkgf581 MayB4, JunB4, Jul84, Aug84,
\
Call Toll Free:
(800) 992-2388, (800) 992-6577 (in California)
1590 Sunland Lane, Costa Mesa, CA 92626
Nov/Dec84, Jun85, Jul85, AugB5,
Sep85, OctB5, Novas, DecB5,
pkgf781 JanBB, FebBB, MarBB, AprBB,
Mayes, JunBB, JulBB, AugBB,
SspBB, OctBB, Nov86, DecBB,
Future scanning projects are planned by the International Arcade Museum Library (IAML).