Other related circuits ( 15 ) :

• 300V peak-to-peak signal generator - converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times, pdf file   
• Basic Missing Pulse Detector   
• Circuit makes simple FSK modulator - The need for a compact telemetry system poses a challenge for designing a small, light, low-component-count system. Commercial FSK (frequency-shift-keying) modulators are bulky and need many passive components. This circuit uses a single NOT gate (inverter), an On Semiconductor NL27WZ14 in a surface-mount package, to generate continuous FSK data from TTL-level signals. This circuit is designed to provide 2400 Hz / 1200 Hz FSK, but can be adapted for other frequencies up to an operating frequency of approximately 80 kHz.   
• Convert periodic waveforms to square waves - converts various waveforms to square wave with adjustable duty cycle   
• Delay line implements clock doubler - using a 5-nsec delay unit, a 50- MHz, 50% duty-cycle square-wave input produces a 100-MHz, 50% duty-cycle output clock   
• Frequency doubler operates on triangle waves   
• Insect Repellant - a 22KHz oscillator with piezo output   
• Line powered 60 Hz clock generator - optosolated circuit is connected to the 120vac power line and transfers 60Hz clock pulses to a logic circuit, provides 5000V isolation from line, pdf file   
• Negatrons enrich filter, oscillator designs - atest wave of high-performance op amps allows you to incorporate "negatrons" (synthesized negative resistors) into your oscillators and filters   
• PSpice tunes oscillator circuits - optimization technique to determine the impedance, ZB, that compensates for parasitic phase shifts that the real amplifier introduces in this high-frequency oscillator   
• Ring oscillator measures cable length - ECL exclusive-NOR gate (F100107) and a length of cable form a simple ring oscillator, the delay from the cable and the gate determine the ring oscillators frequency, 100m cable yields approximately a 1 MHz oscillation frequency   
• Self-powered Sine to Square wave Converter - Converts sine to square waves without a power-source   
• Slew Rate Control - A circuit that limits the rate of change of a signal; a feature of this design is that the positive and negative rates can be different.   
• Ultrasonic Dog Whistle   
• Watchdog circuit uses ac triggering - A dc-triggered reset of a watchdog circuit is prone to failure. If the watchdog program hangs up, then the reset signal becomes activated continuously, and the microprocessor has no way to escape the situation. This simple solution uses an ac trigger to reset the watchdog circuit.   

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