Comparator for over-voltages
To maintain an alarm condition when an overvoltage transient disappears, add an SCR to the comparator circuits. For SCR operation, voltages to the comparator i...
Voltage comparator circuit
An op amp is used as a comparator and a sink for LED current. The output voltage of the amplifier changes about 1.4 V depending on the direction of the current....
AC bridge using LF356
The circuit provides a simple and cost-effective solution to matching resistors and capacitors. Impedances ZR and Zx form a half-bridge, while OSC and OSC excit...
Differential A/D Converter circuit CA3110
By using an op amp BiMOS CA3140 provides good orientation skills for high bandwidth signal input, and can quickly adjust the energy output at its terminal CA33I...
Input pulse width controller circuit
The quad operational amplifier circuit yields full 0 to 100 percent pulse width control. The controller uses an LM3900 requires only a single supply voltage of ...
Simple differential amplifier circuit
Operational amplifiers Al and A2 are connected in a noninverting configuration of their training sorties amplifier A3. The operational amplifier A3-one could ca...
Attenuator circuit
A op amp and transistors Q1 and Q2 exponential converter to generate an exponential gain control current, which is introduced into the rectifier. A reference cu...
Auto gain control op-amp circuit
An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negat...
Thermocouple Amplifier circuit (CA3193)
The circuit needs 15 volts and uses a precision op amp CA3193 BiMOS to amplify the signal generated more than 500 times. Three 22-megohm resistors provide large...
Unity gain Inverter amplifier circuit
The circuit consists of a device with low drift LTl012. and a speed amplifier LTl022Jligh. The entire circuit is a unity gain inverter, with the summing node at...
Simple logarithmic amplifier circuit
This simple logarithmic amplifier circuit use the LT1012 which has a low bias current allow 4 1/2 decades off voltage input logging....
Small leakage pre-amplifier
The circuit uses the LM301 has an input leakage of only 2 pA typical at 75 ° C and is used with 1 M ohm input resistance.
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Gain buffer circuit
The difference between these amplified signals is used to set the 's bias and hence Ql Q2 current channel. This Ql forces of V GS at all that is required voltag...
Magnetic Cartridge Preamplifier (LT1028CN8)
A high performance op-amp that sets a new standard of excellence in noise performance only 0.9nV/Hz with low source resistances. Total harmonic distortion is le...
Bandpass Filter schematic
A bandpass filter passes a range of frequencies while rejecting frequencies outside the upper and lower limits of the passband. The range of frequencies to be p...
Opamp Filters schematics
The figures below illustrate using opamps as active 2nd order filters. Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filte...
Simple Thermocouple Amplifier circuit
Continuing with the thermocouple interface concept, the next step is to amplify the TC's millivolt signal into a more readable analog voltage, on the order of 0...
under?-over voltage detector
In Fig.1 A precision DC under?voltage relay switch. The opamp is wind as a voltage comparator, with a reference voltage applied to pin 2 and the test voltage a...
Simple DC to 20 MHz Driver
The output cable from my 20 MHz function/sweep generator dangled over the side of the workbench, the alligator clip hovering over the floor. Deeply engrossed in...
1 to 5 Video splitter
The circuit is based on the type EL2020 (or similar) operational amplifier which is marled by large bandwidth. The LL2020 amplifies the video signal applied to ...