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Color light-emitting diodes with different colors can indicate the operational status of electrical equipment, as illustrated in the accompanying figure. The red light-emitting diode (LED) R emits red light when energized, indicating that the 220V power supply is functioning...
A keyboard key functions by establishing an electrical contact between the surface of the keyboard and the underlying circuit when the keytop area is pressed. This mechanism was utilized by some home computers in the early 1980s and has...
The circuit was designed to create a low-cost frequency meter that will cover the range of 1 Hz to 1 MHz with a digital indication using three 7-segment displays. The frequency meter circuit operates by measuring the frequency of an...
This circuit is a small digital roulette. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from...
Diode D1 and resistor R1 provide VDD isolation during the programming of 24-pin devices. Jumper J3 must be shorted for 24-pin devices and left open for programming 28-pin devices. The following EEPROMs are pin compatible with their EPROM versions. In...
The MM5314 is a monolithic MOS integrated circuit that incorporates P-channel low threshold enhancement mode and ion implanted depletion mode devices. It features an internal multiplex oscillator, fast and slow set controls, a single power supply, 7-segment outputs, leading...
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