TRANSISTORIZED COUNTING SYSTEMS. 1. Basic Transistor Trigger Circuits used in the Counting Systems
A description of a basic trigger circuit element containing two similar (i.e., n-p-n or p-n-p) transistors is presented. The circuit employs coupling between emitters and from one collector to the other base with clamping diodes serving the dual function of stabilizing operating conditions and preventing collector saturation in both transistors. Suitable choice of component values and voltage supplies yields circuits capable of astable, mono-stable, or bistable operation. The virtues claimed for the circuit include a high impedance sensitive input, a low impedance output poirt, and also an output point which is external to the feed-back loop and which can therefore be loaded in any reasonable way without affecting circuit operation. Variants of the basic circuit which provide a fast recovery, accurate trigger threshold, and a variety of other features are described. A complementary pair (i.e., p-n-p & n-p-n) transistor circuit which may be used as a relay driver is also described. (auth)
- Research Organization:
- Atomic Energy of Canada Ltd. Chalk River Project, Chalk River, Ont.
- NSA Number:
- NSA-12-014087
- OSTI ID:
- 4324215
- Report Number(s):
- CREL-767; AECL-658
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- Canada
- Language:
- English
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