LED Car Battery Voltmeter circuit

Automatic Switching for Battery USB Power Connection

This is a simple circuit for automatic switchover between battery and USB port. This circuit uses a more general step-up converter architecture. The circuit designed for automatic switchover between a battery and a USB power source employs a step-up converter...

Wide band AC voltmeter

This voltmeter is capable of measuring AC signals as low as 15 mV at frequencies from 100 Hz to 500 kHz. Full-scale sensitivity may be changed by altering the values of R1 through R6 (R = Vin/100 µA). The described voltmeter...

PC 12V ADAPTER

This circuit provides a short circuit protected power supply from PC 12V supply voltage. This is particularly handy when working with PC interfacing projects. More: Fig-1 shows the circuit diagram of the complete power supply. The necessary 12V supply voltage...

Automatic 12V Lead Acid Battery Charger

R2 must be adjusted to establish the correct finish charge voltage. Flooded and gel batteries are typically charged to 13.8V. For cycling batteries, such as AGM or gel types, battery manufacturers generally recommend a voltage range of 14.5V to 14.9V....

Battery discharge status indicator circuit

When the battery voltage is within the range of 7 to 12.6V, the light-emitting diode VLi illuminates, maintaining a consistent brightness. If the battery voltage drops below 7V, VLi begins to emit a red light, and the brightness of the...

STEREO LED VU METER

This circuit offers a cost-effective alternative to the LM3915 series LED displays. It utilizes a square-wave oscillator constructed with two CMOS analog switches, which alternately select the right and left channels for monitoring and display. The chosen signal is amplified...

12V smooth Flashing circuit

This circuit ensures that a blinking slowly, ie the lamp is brighter lights until a maximum is reached and then gradually decrease in strength until the lamp is off. IC1a opamp is used here to a triangular voltage generation. The...

Bicycle LED POV hardware

The microcontroller unit (MCU) will read images from the DataFlash memory via the SPI bus based on the known velocity. It will then send these images to the LED drivers using the SPI bus, controlling the on and off states...

old dick smith catalog mains led circuit

Hello everyone. This is my first post in quite some time. I obviously do not have an old enough catalog for reference. In the data section, there were references to... The input data indicates a lack of sufficient information regarding the...