We can use transistorized low dropout voltage regulator circuits to achieve stable output voltages. These voltages can start at 3 V and go up to 5 V, 8 V, 9 […]
Low-cost Transformerless Hi-Watt LED Driver Circuits with Surge Protection
I was forced to address the issue once and for all after receiving a growing number of reader complaints about burning LEDs related to my previously released transformerless 1 watt […]
Low-Cost LED Lamp Circuit Powered by Phone Charger
This tutorial looks at utilizing easily accessible components to make an LED wall light that is both basic and powerful. For many LED lighting applications, a phone charger—which normally provides […]
Using 555 Alarm to Detect and Alert Battery Low Voltage
This low battery alarm circuit using IC 555 was initially used in conjunction with an automated mains/battery DC power supply to power transceivers. Having the power supply usually at 13.6 […]
Battery Low Voltage Alarm Circuit using NAND Gates
The Battery Low Voltage Alarm circuit has a very significant purpose aside from its basic design. It alerts you when a battery is about to run out so you can […]
High Low Temperature Alarm Circuit using Transistors
This high/low temperature indicator circuit uses only BJTs and the temperature is being monitored by a thermistor. This straightforward temperature alarm circuit is set to sound an alert (either vocally […]