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Five-pole active filter – Circuit Schematic
Five-pole active filter
The above realization of a type 03 receive filter is accomplished using eight OP-OS"s. As can be seen from the response curve, the >30dB attenuation in the stop...
Capacitive load driver – Circuit Schematic
Capacitive load driver
The circuit employs a 100 ohm isolation resistor which enables the amplifier to drive capacitive loads exceeding 500 pF; the resistor effectively isolates the h...
Precision full wave rectifier – Circuit Schematic
Precision full wave rectifier
The circuit provides accurate full wave rectification. The output impedance is low for both input polarities, and the errors are small at all signal levels. Not...
Double-ended limit detector – Circuit Schematic
Double-ended limit detector
Detector uses three sections of an L144 and a CMOS NAND gate to make a very low power voltage monitor. The 1 MO resistors Rl, R2, R3, and R4 translate the bipol...
Fast half-wave rectifier – Circuit Schematic
Fast half-wave rectifier
Precision half wave rectifier using an operational amplifier will have a rectification accuracy...
Precision peakvoltage detector – Circuit Schematic
Precision peakvoltage detector
The circuit has negative feedback only for positive signals. The inverting input can only get some feedback when diode Dl is forward biased and only occurs when...
Precision current sink – Circuit Schematic
Precision current sink
The 2N5457 JFET and PN2222 bipolar have inherently high output impedance. Using Rl as a current sensing resistor to provide feedback to the LM101 op amp provide...
Precision current source – Circuit Schematic
Precision current source
The 2N5457 and PN2222 bipolar serve as voltage isolation devices between the output and the current sensing resistor, Rl. The LM101 provides a large amount of l...
Sine wave-to-square wave converter – Circuit Schematic
Sine wave-to-square wave converter
The sine input is ac coupled by capacitor C; Rl and R2 bias the input midway between Vn and Vp, the input threshold voltages...
Voltage-to-current converter – Circuit Schematic
Voltage-to-current converter
The current out is Iqut—Vin/R. For negative currents, a PNP can be used and, for better accuracy,-a Darlington pair can be substituted for the transistor...
Current-to-voltage converter – Circuit Schematic
Current-to-voltage converter
A filter removes the dc component of the rectified ac, which is then scaled to RMS...
Current-to-voltage converter – Circuit Schematic
Current-to-voltage converter
Converter features eight decades of current range...
Comparator – Circuit Schematic
Comparator
An operational amplifier is used as a comparator which is capable of driving...
Comparator with time out – Circuit Schematic
Comparator with time out
The MC1422 is used as a comparator with input (Pin 5)...
Window comparator – Circuit Schematic
Window comparator
This circuit gives an output (which in this case is OV) when an input voltage lies in between two specified voltages. When it is outside this window, the output...
Dual limit comparator – Circuit Schematic
Dual limit comparator
This circuit gives a positive output when the input voltage exceeds 8 volts. Between these limits the output is negative. The positive limit point is determined...
Comparator with variable hysteresis – Circuit Schematic
Comparator with variable hysteresis
An operational amplifier can be used as a convenient device for analog comparator applications that require two different trip points. The addition of a positiv...
Null detector – Circuit Schematic
Null detector
Null detector uses simple LED readout to indicate if test resistor R* is below, equal to, or greater than test resistance Rref. IfR* = Rref, the 741 output sits...
Battery condition indicator – Circuit Schematic
Battery condition indicator
A 741 op amp is employed as a voltage comparator. The noninverting input is connected to zener reference source. Reference voltage is 5V. R2 is adjusted so that...
Overspeed indicator – Circuit Schematic
Overspeed indicator
An op-amp comparator is used to compare the converter output with a dc threshold voltage. The circuit flashes the LED when the input frequency exceeds 100 Hz. I...