Function of the card:
Alloy-driver, current
Alloy-Driver,Current
Gated 270mA Current Switch w/Emitter Follower
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number: 371397
PCB number: 492947
Used in: IBM 1620
Cap code: None (details)
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.
Image courtesy of Eric Schlaepfer
Pinout:
 |
A II1 B I2 C IO1 D O2E E I1 F G H J GND K L M -12V N P -36V Q R |
Coslet data
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. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.