GB916321A - Improvements in or relating to transistor circuits for comparing electrical voltages - Google Patents
Improvements in or relating to transistor circuits for comparing electrical voltagesInfo
- Publication number
- GB916321A GB916321A GB415358A GB415358A GB916321A GB 916321 A GB916321 A GB 916321A GB 415358 A GB415358 A GB 415358A GB 415358 A GB415358 A GB 415358A GB 916321 A GB916321 A GB 916321A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- base
- voltage
- emitter
- variations
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
- H03K17/64—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors having inductive loads
Landscapes
- Electronic Switches (AREA)
Abstract
916,321. Transistor comparator circuits. BAILEY METERS & CONTROLS Ltd. Feb. 6, 1959 [Feb. 7, 1958], No. 4153/58. Class 40 (6). In a voltage comparator a variable voltage applied to the base of a first transistor is compared with stable reference voltage derived from a Zener diode and applied to the base of a second transistor, the stable voltage being in series with the emitter-base voltage of the second transistor in the emitter base circuit of the first transistor so that variations in output current caused by changes of emitter base voltage of the first transistor due to temperature changes are commensated by variations in the base emitter voltage of the second transistor. In the Figure an alternating current input voltage is applied through terminals X to the base of a first transistor T1 while a reference voltage is applied from a Zener diode Z6 to the base of the second transistor. If the input voltage exceeds the voltage applied to the base of the second transistor sufficient current flows in the first transistor to operate a relay 15. Variations in the operation of the circuit due to variations with temperature of the base emitter circuit of the first transistor are compensated by corresponding variations in the base emitter circuit of the second transistor, the two transistors being mounted in closely-spaced holes in a relatively large metal block. Temperature compensation for the Zener diode Z6 is effected by a temperature-sensitive resistor R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB415358A GB916321A (en) | 1958-02-07 | 1958-02-07 | Improvements in or relating to transistor circuits for comparing electrical voltages |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB415358A GB916321A (en) | 1958-02-07 | 1958-02-07 | Improvements in or relating to transistor circuits for comparing electrical voltages |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB916321A true GB916321A (en) | 1963-01-23 |
Family
ID=9771743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB415358A Expired GB916321A (en) | 1958-02-07 | 1958-02-07 | Improvements in or relating to transistor circuits for comparing electrical voltages |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB916321A (en) |
-
1958
- 1958-02-07 GB GB415358A patent/GB916321A/en not_active Expired
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