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Adjustment-free precision summing amplifier – Circuit Schematic
Adjustment-free precision summing amplifier
This circuit produces continuous outputs that are a function of multiple input variables....
Cable bootstrapping – Circuit Schematic
Cable bootstrapping
Bootstrapping input shield for a follower reduces cable capacitance, leakage, and spurious voltages from cable flexing...
Inverting amplifier with balancing circuit – Circuit Schematic
Inverting amplifier with balancing circuit
Req may be zero or equal to the parallel combination...
Absolute value amplifier – Circuit Schematic
Absolute value amplifier
The circuit generates a positive output voltage for either polarity of input. For positive signals, it acts as a noninverting amplifier and for negative signals...
Voltage controlled amplifier – Circuit Schematic
Voltage controlled amplifier
This circuit is basically an op amp with an nal (±10 mV) between pin 2 and 3 and by extra input at pin 5. A current Iabc is injected controlling the current ...
Logarithmic amplifier – Circuit Schematic
Logarithmic amplifier
Unusual frequency compensation gives this logarithmic converter a 100 µs time constant from 1 mA down to 100 µA, increasing from 200 µe to 200 ms from ...
SWR warning indicator – Circuit Schematic
SWR warning indicator
Op amp with dc input from SWR meter can be adjusted to preset the SWR reading...
Thermocouple amplifier – Circuit Schematic
Thermocouple amplifier
Input protection circuitry allows thermocouple to short to 120 Vac without damaging the amplifier. Calibration: Apply a 50 mV signal in place of the thermocoupl...
Sound AC switch – Circuit Schematic
Sound AC switch
The circuit uses a 741 op amp operating as an inverting amplifier to amplify the voltage produced by an 8-ohm speaker used to detect any sounds. The feedback re...
Sine-wave shaper – Circuit Schematic
Sine-wave shaper
Uses a CA3140 BiMOS op amp as voltage follower, together with diodes from a CA3019 array, to convert a triangular signal (such as obtained from a function gener...
Infinite sample and hold amplifier – Circuit Schematic
Infinite sample and hold amplifier
During normal' 'hold'' mode, the replicated analog voltage is buffered straight through the S/H amplifier to the output. Upon issuance of a SAMPLE signal, the S...
Performance sample and hold – Circuit Schematic
Performance sample and hold
When switch SWl is positive, the FET is turned on, and has a resistance of about 400 ohm. The input voltage charges up the capacitor through the FET. When SWl i...
Sample and hold circuit II – Circuit Schematic
Sample and hold circuit II
This circuit rapidly charges capacitor CST0 to a voltage equal to an input signal. The input signal is then electrically disconnected from the capacitor with th...
Sample-and-hold circuit – Circuit Schematic
Sample-and-hold circuit
The circuit uses a CA3130 BiMOS op amp as the sample-readout amplifier for the storage (sample-holding) capacitor Cl, and a CA3080A as the sample-control amplif...
Microvolt probe – Circuit Schematic
Microvolt probe
The current tracer helps locate a defective IC that is loading down the power supply. The tracer amplifies the small voltage drop caused by current flow along a...
Sound trigger for flash unit – Circuit Schematic
Sound trigger for flash unit
The circuit is based on operational amplifier IC1 used in the noninverting amplifier mode. Rl and 2 set the gain at about 500. RV1 (sensitivity) biases the noni...
Peak detector II – Circuit Schematic
Peak detector II
If subsequent input voltage exceeds that stored in Cl, the comparator voltage will go high and charge Cl to new higher peak voltage. ...
peak detector – Circuit Schematic
peak detector
The purpose of the circuit is to hold the peak of the input voltage on capacitor Cl, and read the value, V0, at the output of U2. Op amps Ul and U2 are connecte...
Linear optocoupler for instrumentation – Circuit Schematic
Linear optocoupler for instrumentation
A dual optocoupler is used in a configuration which has the same current throughout as the LEDs. Assuming similar optocoupler features the output voltage must b...
Linear analog coupler – Circuit Schematic
Linear analog coupler
Although the output is low level and cannot be loaded significantly without harming -accuracy, a single I.C. operational or instrumentation amplifier can suppl...