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Buzz box continuity and coil checker – Circuit Schematic
Buzz box continuity and coil checker
Differences between shorts, coils, and a few ohms of resitance...
Low resistance continuity tester – Circuit Schematic
Low resistance continuity tester
This tester can be used to check IC printed circuit boards. Two 4 K resistors and the transistors connected to them prevent current flow through the operational...
Ratiometric resistance measurement – Circuit Schematic
Ratiometric resistance measurement
The unknown resistance is put in series with a known standard and a current passed through the pair. The voltage developed across the unknown is applied to the ...
Ohmmeter – Circuit Schematic
Ohmmeter
This circuit has a linear reading scale, requires no calibration, and requires no zero adjustment...
Linear scale ohmmeter – Circuit Schematic
Linear scale ohmmeter
This circuit is designed to provide accurate measurement and a linear resistance scale at the high end. The circuit has four ranges...
Dosage-rate meter – Circuit Schematic
Dosage-rate meter
A commercial diode is the detector in this highly accurate radiation monitor. The lowdrift FET-input op amp amplifies detector current to a usable level, and th...
Power meter 1KW – Circuit Schematic
Power meter 1KW
The circuit is intended for 117 Vac ± 50 Vac operation, but can be easily modified for higher or lower voltages. It measures true (nonreactive) power beingde...
Shutter tester – Circuit Schematic
Shutter tester
Shutter speed tester combines frequency counter, crystal oscillator, and photo-transistor-operated gate generator. Oscillator pulses are counted as long as the ...
Tlash exposure meter – Circuit Schematic
Tlash exposure meter
Strobe light meter catches the peak of flash intensity and holds it long enough to give a reading...
Automatic contrast meter – Circuit Schematic
Automatic contrast meter
The circuit arrangement consists of a photo-amplifier which feeds a voltage derived from varying light levels in an enlarger to a pair of peak detectors. One fo...
Phase sequence indicator – Circuit Schematic
Phase sequence indicator
Simple, portable phase-sequence indicator determines the proper phase rotation in polyphase circuits. Major components are two neon lamps, two resistors, and a ...
Precision calibration standard – Circuit Schematic
Precision calibration standard
An external power supply that gives a voltage higher than the highest expected rating of the zener diodes to be tested is required. Potentiometer RVl is adjuste...
Sensitive rf voltmeter – Circuit Schematic
Sensitive rf voltmeter
This circuit measures RF voltages beyond 200 MHz and up to about 5 V. The diode should be mounted in a remote probe, close to the probe tip. Sensitivity is exce...
Capacitance meter – Circuit Schematic
Capacitance meter
Output voltage is proportional to the capacitance connected to pin 2 of the charge pump. The meter works over a range of 01 to 0 µF with a set at 111 K. Over...
Low cost ph meter – Circuit Schematic
Low cost ph meter
With guaranteed 1 pA input bias, the ICL 8007A is ideal as a pH meter...
Fet curve tracer – Circuit Schematic
Fet curve tracer
The circuit displays drain current versus gate voltage for both P and N-channel JFETS...
Light meter – Circuit Schematic
Light meter
This light meter has an eight-decade range...
Logarithmic light-meter circuit – Circuit Schematic
Logarithmic light-meter circuit
The meter reading is directlyjproportiona! to the logarithm of the input light power. The logarithmic circuit behavior arises from the nonlineardiode pnjunction...
Visual zero-beat indicator – Circuit Schematic
Visual zero-beat indicator
Light-emitting diodes connected with reverse polarity provide a visual indication of zero-beat frequency. Each LED is on for only half a cycle of the input. Whe...
Five-step voltage-level indicator – Circuit Schematic
Five-step voltage-level indicator
This circuit provides a visual indication of the input analog voltage level. It has a high input impedance at pin 8 and open-collector outputs capable of sinkin...