June 1996
STAR*TEcH Journal
CID
... continued from previous page.
You would need to make each cap double the value
of the NP cap you were making for the value to
come out right.
TRANSISTORS
Transistor substitutions must consider case style,
current and voltage ratings, power dissipation, gain.
Case style is the physical shape of the part. Styles
are called out by a T.O. number (transistor out-
line) . The larger a transistor is, the more heat it
can dissipate, so avoid using smaller transistor for
subs. For the most part a TO3 must be replaced
by a TO3. A TO220 can replace a TO 126 many
times, but I wouldn't go the other way.
4 Design, Improvements to
the Industry Standard
The "Quick Release"
Ticket Dispenser
Improves serviceability
& reduces
maintenance
For the most part the pinouts (which pin is the
emitter, collector and base) will be the same for all
the transistors in a case style with very important
exception. The little plastic TO92 transistor has
two basic pinout arrangements. The Japanese ones
(2SA733, 2SC945) are laid out E-C-B as you look
at the flat face. The American ones (2n3906,
2N4401, 2N-anything) are laid out E-B-C. If elec-
trically equivalent, you can use one for the other,
but you will have to do a little dance with their
leads to make them work.
"Quick Release" face plate
Dynamic, new design allows the
ticket dispenser to "quickly release"
from it's face plate on your cabinet
or ticket door, no tools needed.
Easily replace one dispenser with
another in just seconds. No tools
necessary! The new face plate
When looking at current and voltage ratings more
is better. Never use lower valued parts as subs. Stay
fairly close. Trying to replace a 100 ma part with
one that handles 15 amps would be like trying to
wire a video game control panel with 12 gauge
house wiring.
Transistors sued in control applications are easy to
sub, and power supply circuits also yield to liberal
substitutions. Signal path transistors need to be
closer. If you sub a transistor with one whose gain
was very different into a color circuit, you may
find that color no longer tracks with the other two.
The difference may or may not adjust out.
retrofits any existing Deltronic
Labs machine.
Bottom METAL ticket guide
The extended, durable ticket guide
prevents curled tickets from catching.
Foolproof braking system
Our impressive new braking system
eliminates brake slippage, allowing
foolproof, accurate dispensing.
Optical sensor dust cover
Eliminates dust accumulation and
increases accuracy of the ticket count.
1(11.
Another quality product from Deltronic Labs ...
t
Switching transistors such as horizontal outputs and
the ones in switching power supplier are specially
designed for that use and you should only use
... continued on page 20.
the ;,,du,/,y /eade, lo ttcke/ ,,.,,_.,,.,.
De/Ironic labs, inc.
120 Liberty Lane, Chalfont, PA 18914 • 215-997-7753
FAX I 215-997-9506