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A circuit is needed to drive three or more LEDs at a current of 200-350mA each, with the capability to randomly flash or strobe them at a frequency of 5-20Hz. The input power should be low-voltage DC, with a...
A circuit utilizing one 7400 TTL can operate with fundamental type crystals ranging from 1 to approximately 13 MHz. The output is rich in harmonics, making this oscillator suitable for calibration and testing applications. The circuit in question employs a...
Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are both high and low level outputs which may be adjusted with the level...
A crystal oscillator circuit is composed of several gates. Figure (A) illustrates a crystal oscillator circuit operating at 1 MHz, while Figure (B) depicts a 20 MHz crystal oscillator circuit. Figure (C) represents a variable crystal oscillator circuit with...
Essentially, this is a Hartley oscillator utilizing a triple-emitter follower, suitable for audio and low radio frequencies. The frequency is determined by the components, and at 1 kHz, a typical capacitor value would be 4.7 µF tantalum, although this...
The circuit comprises a basic oscillator (above the dashed line) and an automatic keyer (below the dashed line). The unit can be utilized with either a straight hand key or a paddle key for automatic operation. The described circuit integrates...
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