Conrad Course material 3964 14 years and over 3964 Manual De Usuario
Los códigos de productos
3964
12
Fig. 30: Conducting and blocking (Schaltung10.jpg)
With a short connection S1, you fire the circuit so that the LED shines. With S2, by contrast, the conductive state can
be erased. S3 switches the LED on, but at the same time erases the conductive state of the transistors. After opening
S3 the LED is thus off.
Fig. 31: On or off (Aufbau10.jpg)
12.
Step: Push-pull flasher
This electronic flasher works in push-pull action: two LEDs are automatically switched so that only one of them is on at
any time. The symmetrical flasher circuit shown in Fig. 32 is also called a multivibrator. Feedback takes place via two
capacitors. With the electrolytic capacitors, you have to pay attention to the polarity, since the voltage at the respective
collector is higher on average than at the opposite base. The state of the circuit only remains stable as long as the
charge reversal of the capacitors is still taking place. Afterward the circuit flips into the other state. With two 100 µF
electrolytic capacitors a very slight flashing frequency results, with fewer than five complete alternations per minute.
any time. The symmetrical flasher circuit shown in Fig. 32 is also called a multivibrator. Feedback takes place via two
capacitors. With the electrolytic capacitors, you have to pay attention to the polarity, since the voltage at the respective
collector is higher on average than at the opposite base. The state of the circuit only remains stable as long as the
charge reversal of the capacitors is still taking place. Afterward the circuit flips into the other state. With two 100 µF
electrolytic capacitors a very slight flashing frequency results, with fewer than five complete alternations per minute.
Fig. 32: The multivibrator (Schaltung11.jpg)
green
red
green