Astable multivibrator gets hysteresis positive-feedback stage
Astable multivibrator gets hysteresis from positive-feedback stage
06.28.2022 Circuits

Many designs exist for logic-based astable multivibrators, one of the simplest being an RC feedback loop around a single inverting Schmitt trigger inverter...

Shunt regulator provides overvoltage protection
Shunt regulator provides overvoltage protection
06.27.2022 Circuits

The circuit uses a typical technique for varying the output voltage of a power supply via a programmable control voltage. Although the topology and schematic details of the power supply are not critical, the protection technique is novel...

Generate pulse width that is inversely
Generate a pulse width that is inversely proportional to the square root of an analog voltage
06.23.2022 Circuits

The circuit is an edge-triggered monostable circuit, based on a previous design of an edge-triggered parabolic-pulse generator...

Positive edges trigger parabolic timebase generator
Positive edges trigger parabolic timebase generator
06.23.2022 Circuits

Nonlinear systems often need to become linear to be useful, and the circuit provides a nonlinear sawtooth pulse for a PWM (pulse-width modulator) that can compensate for nonlinearities in sensors, controllers, or systems...

Memory-termination IC balances charges on series
Memory-termination IC balances charges on series capacitors
06.22.2022 Circuits

As one of today's most interesting component families, high-value capacitors offer ratings ranging from tenths to tens of farads but suffer from relatively low working voltages...

Transconductance amp gives oscillator reciprocal response
Transconductance amp gives oscillator reciprocal response
06.21.2022 Circuits

The circuit is a variation on the familiar integrator/comparator triangle-wave oscillator, which you typically implement with two op amps. An integrator and a comparator connect in a positive-feedback loop; the comparator drives the integrator and vice versa...

Novel Switch Interface Scheme Reduces Microprocessor
Novel Switch Interface Scheme Reduces Microprocessor Pin Count
06.20.2022 Articles

The most common method for interfacing multiple switches – multiplexing – allows for the connection of (N/2)2 switches with N microcontroller I/O lines. The method described below, which has its roots in an LED interface technique commonly known as “Charlieplexing,” makes it possible to interface...

Dynamic-load circuit determines battery internal resistance
Dynamic-load circuit determines a battery's internal resistance
06.16.2022 Circuits

The simplest model of a battery comprises an ideal voltage source that connects in series with a resistance whose value – often a few milliohms – depends on the battery's electrochemical condition and construction. If you attempt to use an ordinary ac milliohmmeter containing a kilohertz-range ac excitation source to measure a battery's internal resistance, you get erroneous results...

Switched-gain op amp serves as phase
Switched-gain op amp serves as phase detector or mixer
06.16.2022 Circuits

Some op amps, such as the AD8041 from Analog Devices and the EL5100 from Intersil, provide a disable pin, which allows you to parallel the outputs of several op amps for video multiplexing. In addition to this multiplexing, you can also use the disable function...

Simple Super Ripple-Eater Also Cleans Battery-Based
Simple Super Ripple-Eater Also Cleans Battery-Based Supply
06.15.2022 Circuits

Many amplifiers, including integrated devices, are afflicted with undesired, implicit input terminals in their power connections. Due to less than perfect power-supply rejection, these implicit terminals admit noise into the signal that the amplifier will magnify...