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f-alpha.net » Electronics » Integrated Circuits » Timer 555 » Let's go... » Experiment 2 - Ctrl Reference Voltage

Experiment 2 - The CTRL Reference Voltage

From the internal circuit diagram of the NE555 you can see that the output pin 5 (CTRL) is directly connected to the point A.

Internal circuit diagram of NE555 with CONTROL output.

Measuring the voltage between Pin 5 (CTRL) and Pin 1 (GND), shows you indeed V = 6 V on your multimeter, or rather 2/3 Vcc.

This voltage is referred to as the reference voltage of the NE555.

Circuit diagram measurement of the reference voltage at the CTRL output.

Circuit measurement of the reference voltage at the CTRL output. (Enlarge)

In almost all practical circuits the CTRL output is connected to GND using a capacitor. This serves to stabilize the reference voltage and to filter out spikes...

Circuit diagram NE555 with a connected CONTROL output.

Circuit NE555 with a connected CONTROL output. (Enlarge)

In the next step you get to know the OUT output.

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