Good morning, I want to build an inverter, among other things to use positive logic on an NE555 as a latch. I tried it with the circuit shown in the picture. The resistor to Vcc is 1kΩ, and at the base of the transistor is 10kΩ. In front of it is a simple button. The…
Hello! I have the following problem. I have a traffic light that's supposed to light up red whenever the road isn't clear. However, when it is, which is what I signal with the switch, the LED should go out, but another one should light up. I had thought of a circuit with a transistor (NPN)…
Hello everyone Can someone help me with the task of how to connect it with diodes? I have uploaded a photo.
Hello, I have built a small LED circuit. Supply voltage: 5V On the LEDs: 2V Imax of the LEDs: 20 mA Current should be 10 mA I have an LED with a 330 Ohm resistor in one string ( 5V – 2V / 330 Ohm = approx. 9 mA ), and two LEDs in series…
What is the voltage at the emitter when 12V is applied to the base and 5V to the collector (NPN transistor)?
My friend connected an ESP32 board incorrectly (reversed GND and VIN). He gave it to me for repair. The "accident" damaged the following components: voltage regulator, 10 uF capacitor, a diode, and a Zener diode. I replaced all the parts, and the board works fine. However, I soldered a normal diode to the position of…
Does anyone know a program for simulating alternating current circuits?
Hello, I urgently need help with electrical engineering. An AC source with Ue=500mVpeak and a DC component of 10V feeds a 100-ohm series resistor and a Zener diode with a breakdown voltage of Uz=6.8V. I measured the input voltage, and it was U=500mVpeak. The voltage across the Zener diode was approximately 8.2 mVpeak, and the…
Hello, I wanted to ask what you can do to use both phases of a diode or how it works
I don't understand either problem, but I don't just want a solution; I want an explanation. Don't all the lights always light up? And what exactly is the difference between alternating current and direct current in this example?
Hello folks, I currently have a surround sound system from Harman Kardon (HKTS 16) from 2010. I've had a new AV receiver (Denon AVR-X2800H) for a year now, which has more power. For some time now, I've noticed that the sound is getting worse and worse. I've now bought a JBL Partybox 110 for parties,…
This circuit is supposed to turn on after 8 seconds of pressing the switch, and the LED should light up, but after pressing the switch, the LED goes out again after about two seconds. Why does it go out again? And why doesn't the circuit work? What should I have positioned differently? Please describe in…