Function of the card:
Alloy-Driver, 12V
Dual 300mA 12V Driver
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number:371881
PCB number:493181
Used in:IBM 1620
Symbol:D
D: Driver. Isolates a signal from its generating source and uses it to drive one or more other circuits without affecting or overloading the generating circuits. Can be used to supply the required power directly or only to activate the circuit through which power is actually supplied.
Transistor type:071 083
IBM 1620 Instructional System Diagrams, p497.
Pinout:
 |
A I1D B I1R C O1 D E O2 F G I2R H I2D J GND K L M -12V N P Q +12V R |
This page created by Ken Shirriff, 2015.
The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.
Creation time: Tue Mar 03 23:40:34 2015.