Posts Tagged ‘555’

Positive Negative Probe with IC 555

With this circuit you can can check that which dot of the circuit is Positive Volt or Negative Volt which. This cheap circuit uses the a little component is will appropriate apply with an automobile or motorcycle. This circuit works during Voltage between 5-15V. When build volt supply of circuit LED 2 pcs. of stick bright but enough check meet Positive Volt make at pin 3 of IC 555 liberate Negative volt come out cause Red LED stick bright next but Green LED switch off down replace. But when check meet Negative Volt make Red LED switch off but Green LED stick bright replace yes . The Diode 1N4002 be formed protect turning pole electricity over. The detail is other , see in the circuit please sir.

Mini Metronome by 555

Linear scale – Small size
40 to 208 beats per minute

* Q1 & Q2 provide linear frequency operation of IC1 following P1 resistance variation.
* Q3 was added in order to obtain a louder click, similar to clockwork metronomes.
* A 12V micro battery was used to obtain a higher output power and more compactness.
* Rotate P1 fully towards R2, then set R1 to obtain 40 beats per minute (compare with another metronome).
* Rotate P1 fully towards R3, then set R4 to obtain 208 beats per minute.
* Finally mark the entire scale with the usual metronome steps, as follows:
40 – 42 – 44 – 46 – 48 – 50 – 52 – 54 – 58 – 60 – 63 – 66 – 69 – 72 – 76 – 80 – 84 – 88 – 92 – 96 – 100 – 104 – 108 – 112 – 116 – 120 – 126 – 132 – 138 – 144 – 152 – 160 – 168 – 176 – 184 – 192 – 200 – 208.

Read More Source:

http://www.redcircuits.com/Page8.htm

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Alternate 555 Oscillator

This is a slightly simpler circuit than the one above. The circuit uses just one resistor and one capacitor with the 555 timer IC to create a stable and reliable oscillator with an output that it a true squarewave.
The formula for calculating the frequency is:

f=1/(1.4*R*C).

The values in the formula are expressed in ohms, farads, seconds and hertz. This formula is much simpler than that of the previous circuit. With the values shown on the circuit, the frequency is calculated as 1050Hz, but like the previous circuit, this arrangement can operate at frequencies up to around 500kHz.
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Read More Source: http://www.geocities.com/electronics3456/555circuits.html
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