Jan 23, 2024 · I'm trying to switch on a NPN transistor (Q2) when the source is above 5.1 V such that it can supply a control line (J3) …

Jan 15, 2024 · I would like to use a Zener and a NPN transistor as a voltage switch to close a 12 VDC relay. My thought was 12 V …

Comprehensive tutorial on designing voltage regulators using Zener diodes and transistors. Learn how to calculate current limits, …

Jan 2, 2024 · The below shown diagram, and the chart shows how the transistor, the zener diode, and the biasing resistor can be …

Jun 16, 2014 · The switching frequencies attainable with Figure 2 (~1MHz) are higher than Figure 1 (~250kHz). There is a cost …

Es gibt allerdings eine preiswertere Methode aus einer Kombination mit einer kleinen Z-Diode und zwei Transistoren, wobei der eine …

Sep 14, 2024 · Both circuits have an opposite polarity supply, Diodes, Electrolytic capacitors. And in positive we use NPN transistor – …

Sep 18, 2025 · The 40V Zener Diode-ZD1 keeps the voltage constant across the base of BD139 NPN transistor-Q1 and Q2-2N3055 …

Apr 21, 2025 · Analysis of the circuit shows that when the voltage is below the breakdown voltage of the Zener diode, the voltage at …

Aug 1, 2026 · The Delay lamp turn on and off circuit is designed with a Zener diode and a NPN transistor. Working condition and …