ne555 circuit
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Monostable multivibrator schematic
The schematic for a monostable multivibrator is shown in figure 3-11. Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized. More: Recall that when the astable multivibrator was first energized, it was...
A Very Useful Timed Beeper Circuit Schematic
This circuit is designed for alerting purposes after a specified duration has elapsed. It is suitable for table games that require a fixed time limit to answer a question or to move a piece, serving as a modern substitute for...
Auto Light Time/ Dimmer
A light timer/dimmer, similar to those found in dome lights, is desired, but guidance on how to begin the project is needed.
A light timer/dimmer circuit is designed to control the brightness of a light source and to provide a timed...
long delay timer circuit diagram
This timer was designed primarily to turn off a portable radio after a specific duration. This feature allows users to fall asleep on the beach or in a hammock, with the assurance that the radio will automatically shut off after...
Voltage doubler circuit using NE555
The circuit diagram of a simple voltage doubler using the NE555 timer is presented. In this configuration, the NE555 IC operates as an astable multivibrator at approximately 9 kHz. The bases of two transistors, Q1 and Q2, are connected together,...
Scmitt Trigger circuit using NE 555
In addition to its timing functions, the two comparators of the 555 timer can be utilized independently for various applications. One such application is a Schmitt Trigger. The inputs of the two comparators (pin 2 and pin 6) are connected...
Self Retriggering Timed Generator Circuit
When power is first applied to the circuit, capacitor C2 begins to charge through LED1, resistor R3, and resistor R4. When the voltage across C2 reaches the input trigger level of operational amplifier U1, the output at pin 6 of...
Saw Transmitter Circuit
This circuit utilizes a sawtooth oscillator along with an output amplifier that drives a transistor. The components C1, C2, and L1 are essential for the oscillator's operation, forming a tank circuit that must be tuned to the resonant frequency. Generally,...
The Ecology of the Oscillator Transmitter
An oscillator-only transmitter appears to be the simplest way to access the radio airwaves; however, it presents several challenges as part of a transmitting and receiving station. The issue of finding an adequate crystal-controlled transmitter for newcomers wishing to operate...