GB1014104A - Light-operated switching circuits - Google Patents
Light-operated switching circuitsInfo
- Publication number
- GB1014104A GB1014104A GB4508762A GB4508762A GB1014104A GB 1014104 A GB1014104 A GB 1014104A GB 4508762 A GB4508762 A GB 4508762A GB 4508762 A GB4508762 A GB 4508762A GB 1014104 A GB1014104 A GB 1014104A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- light
- emitter
- circuit
- operated switching
- 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
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
Landscapes
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
1,014,104. Photosensitive circuits. R. J. F. PETTY. Jan.24, 1964 [Nov.29, 1962], No. 45067/62. Heading G1A. [Also in Division H3] A light operated switching device comprises a transistor T1 having its emitter coupled to a second transistor T2, the emitter-collector circuit of the second transistor including a load P, and a light sensitive device OR connected in the control circuit of the first transistor. The load P is a vehicle parking light, and reduction in light intensity falling on device OR causes transistor T2 to conduct and light lamp P. In a modification, temperature stability is improved by the inclusion of a resistor in the emitter circuit of transistor T2 Fig. 2 (not shown), or by connecting the lamp in the emitter circuit. In the modification of Fig.2 the device OR is included in a potential divider across the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4508762A GB1014104A (en) | 1962-11-29 | 1962-11-29 | Light-operated switching circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4508762A GB1014104A (en) | 1962-11-29 | 1962-11-29 | Light-operated switching circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1014104A true GB1014104A (en) | 1965-12-22 |
Family
ID=10435829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4508762A Expired GB1014104A (en) | 1962-11-29 | 1962-11-29 | Light-operated switching circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1014104A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3388293A (en) * | 1965-05-20 | 1968-06-11 | Fabri Tek Inc | Indicator lamp in a transistor emitter follower circuit with a lamp warmup resistor in parallel with the transistor |
| US3416032A (en) * | 1966-03-23 | 1968-12-10 | Motorola Inc | Lamp dimming circuit |
| US3456155A (en) * | 1965-04-30 | 1969-07-15 | Advance Data Systems Corp | Photosensitive circuit for controlling the intensity of a lamp |
-
1962
- 1962-11-29 GB GB4508762A patent/GB1014104A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3456155A (en) * | 1965-04-30 | 1969-07-15 | Advance Data Systems Corp | Photosensitive circuit for controlling the intensity of a lamp |
| US3388293A (en) * | 1965-05-20 | 1968-06-11 | Fabri Tek Inc | Indicator lamp in a transistor emitter follower circuit with a lamp warmup resistor in parallel with the transistor |
| US3416032A (en) * | 1966-03-23 | 1968-12-10 | Motorola Inc | Lamp dimming circuit |
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