Theory and practice of using the 555 timer. Part two. Practical. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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In this part, we will continue to ride through your brains on the 555 timer, but from a practical point of view, we will consider specific circuits for switching on the microcircuit.
1 schema
This thing starts to work (beep) if for some reason it suddenly becomes dark. That is, the LDR1 photoresistor will no longer receive light or the luminous flux will decrease to a certain critical level.
2 schema
This circuit is designed to stimulate the auditory nerve if the voltage at the "Control" input drops below 9 volts.
3 schema
The simplest type of signaling node. If the sensor S2 closes, the output of the timer will go high and remain high even if the sensor returns to its original state. You can return the low level to the output of the microcircuit by pressing the "Reset" button.
4 schema
Similar to Scheme 1, however, you can adjust the frequency of the beeping tone with resistor R2.
5 schema
Metronome. It emits a measured tick so that novice musicians do not go astray, well, or sleep well. The tick frequency is adjusted by resistor R1.
6 schema
10 minute timer. It is started by pressing the "Reset-Start" button, while the HL2 LED lights up, for example, green. After the time interval has elapsed, the HL1 LED will light up, for example, red. The interval can be adjusted with resistor R4.
7 schema
Schmidt trigger. Useful if you need to get a square wave from a sinusoidal signal, even a distorted and noisy one.
8 schema
Generator of increased accuracy and stability. The frequency is adjusted by resistor R1. Diodes - any germanium. You can also use Schottky diodes.
9 schema
Missed pulse detector. It can be useful. The transistor can be replaced with a domestic KT3107.
10 schema
Dual tone siren. An interesting scheme for experiments with the inclusion of two timers at once.
Publication: radiokot.ru
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