This circuit was found in an Electronic Design. It makes use of a relaxation oscillator to trigger an SCR and two relays. The circuit operates at frequencies of 12 to 180 cycles per minute.
This circuit is suggested by the Linear Applications Handbook of National Semiconductor, being used...
Analog Devices AD7768 24-bit sigma-delta (Σ-Δ) ADCs include an Σ-Δ modulator and digital filter...
This interesting circuit with just 1 transistor was published in Radio Electronics magazine in...