Operating time meter for tape recorder
Abstract
As an alternative to standard tape counters for popular tape recorders, a photo-electric device for measuring operating time so as to give a precise reading of expended and available operating time. The device consists of two optical components in a slotted cylinder attached to the rubberized free-wheeling tension wheel. The first, third and fourth discharge circuits have a calculation coefficient of 10, the second, of 6. Technical features are diagrammed and described. The three components include the mechanical tension wheel and the plate on which the light- and photodiodes are mounted, the basic meter plate and light diode indicators and related components. If quality parts are properly mounted, no calibration is required. Features of mechanical tape regulation permitting smooth monitoring of tape movement may make the photoelectric device described unnecessary.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- March 1985
- Bibcode:
- 1985RpEEE....Q...6G
- Keywords:
-
- Optical Measuring Instruments;
- Photoelectric Emission;
- Tape Recorders;
- Time Measurement;
- Circuit Diagrams;
- Circuits;
- Counters;
- Photodiodes;
- Tension;
- U.S.S.R.;
- Instrumentation and Photography