Classic-op-amp-astable-multivibrator
Uses CA3130 BiMOS op amp that operates at a frequency of 1 kHz. With rail-to-rail output swing, frequency is independent of supply voltage, device, and tempe...
Four-output-waveform-generator
Many applications require control signals that have phase shifts with reference to an input signal. Circuit accepts a sine, square, or triangular wave as an in...
Linear-triangle-wave-timer
Using one current source for tbe charge and discharge path in this circuit ensures identical rise and fall times at the capacitor terminal. A Darlington pair...
Frequency-doubler
The output contains the sum component, which is twice the frequency of the input, ...
Alternating-led-flasher
The alternating LED flasher is simply a twotransistor oscillator witb LEDs connected to tbe collector of each transistor, ...
Scr-flasher
This de flasher uses two SCRs and a unijunction oscillator clock to set the flash rate, ...
Astable-multivibrator
The 4047 is configured as a free-running, astable- multivibrator (oscillator) circuit. That configuration, offers three different outputs. The output pulses a...
Three-year-led-flasher
Inserting two 1-MO resistors, R1 and R2, in the output stage of one of the circuit"s inverters limits the current needed by the oscillator tone more than a few...
50Mhz-vhf-crystal-oscillator
Diagram shows a 50MHz oscillator operating on a third harmonic. The collector"s load resistor R1 has been increased because the quartz crystal"s internal serie...
100Mhz-vhf-crystal-oscillator
Diagram shows a 100MHz oscillator operating on the fifth harmonic. Again to maintain the transistor"s gain, note the increase in the collector"s load resistanc...
Marker-generator
The oscillator section uses three sections of a 7400 quad NAND gate integrated circuit. The 1-MHz signal from the oscillator is fed into a 7 490 decade counter...
20Mhz-vhf-crystal-oscillator
A typical circuit at 20 MHz is shown. The crystal, which has an internal series resistance Rs of 14ohm, oscillates at its third harmonic. The diode clamp Dl an...
Temperature-compensated-crystal-oscillator
This circuit uses LTC1043 to differentiate between a temperature sensing network and a de reference. The single-ended output biases a varactor-tuned crystal os...
Crystal-controlled-reflection-oscillator
This unit is easily tunable and stable, consumes little power, and costs less than other types of oscillators tlmt operate at the same frequencies. This unusua...
Two-gate-quartz-oscillator
A SN7400 quartz crystal and a resistor provide a square-wave output of approximately 3.5 V. ...
Voltage-controlled-crystal-oscillator
A voltage-variable capacitance tuning diode is placed in series with the crystal feedback path. Changing the voltage on VR varies the luning diode capacitance ...
1Mhz-pierce-oscillators
The circuit is an inverter set up as a linear amplifier. Adding the· crystal and capacitors to the feedback path, we turn the amplifier into an oscillator an...
Low-frequency-pierce-oscillator
The Pierce circuit oscillates at 4kHz. At low frequencies, the crystal"s internal series resistance Rs is quite high (45 Kat 4kHz). ...
Crystal-timebase
An on-board oscillator and a 17-stage divider compose IC1. By connecting a standard 3.58-MHz, television color-burst crystal as shown, an accurate source of 60-...
Easy-start-up-crystal-oscillator
This low cost, crystal-controlled oscillator uses one TTL gate. Two factors ensure oscillator start-up: The connection of NAND gates G1, G2, and G3 into an uns...