Star Tech Journal

Issue: 1988-March - Vol 10 Issue 1

March 1988
3
STAR*TECH Journal
'

~
IECH
JOURNAL
P.O. Box 1065
18 North Centre Street
Merchantville, NJ 08109
Phone: 609/662-1080
FAX:
609/488-9326
Modem: 404/631-2928
Publisher /Editor:
Office Manager:
Contributors:
James Calore
Sharon DiRenzo
Arnie Aarstad
James Beck
Lyle Burnett
John Coccioletti
Sam Cross
David Dickson
Jim Ennis
Todd Erickson
Mike Hally
Jim Kelly
Mark McCain
Fritz Runyon
Mohamed Salem
Mark Sherman
Mike Sickenberger
Tom Skantar
Frank Seninsky
Al Vernon
STAR*TECH Journal, March 1988, Volume 10, Number
l. Copyright © 1988 by Star Tech Journal. Inc. All rights
reserved. Address inquiries to: PO Box l 065. Mer-
chantville. NJ 08109. Phone: 609/662-1080. Subscrip-
tion rates: USA $56.00. Canada $63.00 (US funds).
Other Countries $98.00 Air Mail (US funds).
POSTMASTER: Send address changes to STAR* TECH
Journal. PO Box 1065. Merchantville. NJ 08109.
STAR*TECH Journal (ISSN 0739-1048) is published
monthly by Star Tech Journal. Inc .. 18 North Centre
Street. Merchantville, NJ 08109. Second Class post-
age paid at Camden. NJ.
WANTED: Dead or Ahve
USED P.C. BOARDS!
7 Amp Power Supply ....... . $29.95
12 Amp Power Supply ........ 35.95
(6 month warrenty on power supplies)
19" Color Monitor ............ $199
13" Color Monitor ............ $189
We are the leading
CONVERSION KIT
PARTS SUPPLIER
in the business. Joysticks,
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DISCOUNT ELECTRONICS
With The Operator In Mind
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- MARCH SPECIALS -
P4040 - 14.50 (Draw 80 Processor)
2716 - 2.50
Call Linda
2732 - 3.75
Today She
2764 - 2.50
Wants Your
27128 - 3.95
Business
27256 - 4.25
8080A - 5.95
7805, 7812, 7905, 7912 - 49¢
Quantity Discounts
O.E.M. Account Specialist
We Have A Full Line Of
Integrated Circuits And Electronic
Components At Discount Prices.
1 -800-356-3 7 59
In NJ - 609-346-9814
13 Tenby Chase Dr.
Voorhees, NJ 08043
1 Million Dollars
On The Shelf
Inventory
STAR*TECH Journal
Seeburg SCD-1 Mic Problem.s
Mohamed Salem, Service Manager
Bowling & Billiard Supplies of Dallas
Dallas, Texas
SYMPTOMS
High distortion mic problems.
SOLUTION
We had a high distortion problem on the
output of the new See burg laser CD mic. To
solve these problems in a huny, we installed
a Rowe mic with some modification to suit
the laser CD power amplifier. The output
was great but we still had a problem with the
low volume output.
The sound quality is better with the Rowe
mic but it needs to be modified to work with
the Seeburg system.
For three more dollars, we installed an audio
amplifier circuit in between the power ampli-
fier and the Rowe mic.
Now we can get a high volume control output
with no distortion (providing the MIC volume
control is on minimum). The audio is now
clear, clean and distinct. To date, we have
had no problems with this modified setup.
PROCEDURE
The following is the audio amplifier sche-
matic and also how we converted a Rowe mic
into a Seeburg CD mic.
MIC HOOKUP
J5 SEEBURG
Red
Shield
Green
White
+15 Vdc
Ground
Signal
Page
ROWE MIC
Red
Shield
White
Blue
JS ON POWER AMPLIFIER
Pin 2
+15 Vdc
Mic (signal)
Shield
Mute (Page)
Pin 5
Pin 3
Pin 1
AUDIO AMPLIFIER CIRCUIT
+15
Signal Out to
white wire on
Rowe Mic
Signal In
from
Pin 5 of J5
100uF/16v
Grid
ROWE MIC CONVERSION
1. Unscrew bottom plate
2. Clip off yellow wire
3. Jumper red wire on switch to ground
4. Clip same (red) wire between PC board and
switch. Then tie directly to +15 Vdc.
This circuit will have a ~ain of 20, w~ich is
sufficient in this case. However the gain c&n
be increased to 200 if a 70uF/76v capI
installed between pins 7 and 8 of the IC .

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