Staircase-generator
This circuit is a high-input impedance version of the so-called diode pump or staircase generator. Note that charge transfer takes place at the negative-going ...
Quadrature-outputs-oscillator
The XR-567 functions as a precision oscillator with two separate square-wave outputs at pins 5 and 8, that are at nearly quadrature phase with each other. ...
High-current-oscillator
The oscillator output of the XR-567 can be amplified using the output amplifier and high-current logic output available at pin 8. In this manner, the circuit...
Nearly half duty cycle multlvibrator
Three factors contribute to the output symmetry. The capacitor charges and discharges through the same external resistor. An internal resistive divider sets ...
Electronic-bird-chirper
Transistors Ql and Q2 form the two halves of a free-running multivibrator whose frequency is determined by the voltage across C8. That capacitor is charged and...
555-Beep-transformer
The simple circuit transforms the steady beep of an audible-signal device, such as a Mallory sonalert, into a distinctive warble or chirp. The value of R, C2...
The-wailing-siren
Transistors Ql and Q2, with feedback provided via Cl from the collector of Ql to the base of Q2, forms a voltage-controlled oscillator (VCO). De- pending on t...
Programmable-frequency-adjustable-rate-siren
The LM380 operates as an astable oscillator with the frequency determined by R2/C2. Adding Ql and driving its base, with the output of an LM3900 wired as a sec...
Yelping-siren
Unijunction transistors Ql and Q2 are both connected as relaxation-type, sawtooth oscillators. Transistor Ql is the low-frequency control oscillator and Q2 is ...
Single-supply-wien-bridge-oscillator
The Adjustment of R4 contributes to the comparatively symmetrical output transfer characteristic of the CA3420 BiMOS op amp. ...
Stabilized-wien-bridge-oscillator
A variable Wien bridge provides frequency tuning from 20 Hz to 20kHz. Gain control comes from the positive temperature coefficient of the lamp. When power is a...
Signal-injector
The unit provides a square-wave output that is rich in harmonic content. The circuit"s output frequency can be varied from 50 Hz to 15 kHz. The heart of the ...
Signal-injector
This unit is a single oscillator built around an LF351 JFET-input op amp. Resistors Rl and R2 bias the noninverting input while R3 biases the inverting input...
Accurate-ramp-generator
The ramp generator, an inexpensive alternative to commercial function generators, provides a more linear and repeatable output than conventional analog integra...
Cro-doubler
IC1a, IC1b, and IC1c of the quad two-input NAND gate 4011 are connected as an astable multivibrator; IC1d is connected as an inverter. Terminals 3 and 11 of th...
Oscilloscope triggered sweep circuit
The circuit"s input op amp triggers the timer, sets its flip-flop and cuts off its discharge transistor so that capacitor C can charge. When capacitor voltage ...
Oscilloscope-calibrator
The calibrator can be used to check the accuracy of a time-base generator, as well as to calibrate the input level of amplifiers. The calibrator consists of an...
Low-voltage-wien-bridge-oscillator
This circuit utilizes an HA-5152 dual op amp and FET to produce a low-voltage, low-power, Weinbridge sine-wave oscillator. Resistors R and capacitors C control...
5-V-oscillator
Consistently self-starting and yet capable of operating from over 1 Hz to 10 MHz, this low-cost oscillator requires only five components. ...
Precision-voltage-controlled-oscillator
This circuit uses a CA3130 BiMOS op amp as a multivibrator and CA3160 BiMOS op amp as a comparator. ...