Battery life has always been a critical consideration for most of the electronic gadgets and equipment. When we talk about spy cameras, which normally ...
Saturday, July 15, 2017
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LED Volt Meter Circuit
Here is a Simple LED Volt meter to Monitor the charge level in Lead Acid Battery or Tubular battery. The terminal voltage of the...
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Sensitive Audio Power Meter
As a follow-up to the simple audio power meter described in [1], the author has developed a more sensitive version. In practice, you rarely ...
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Automatic Bicycle Light
T his automatic bicycle light makes cycling in the dark much easier (although you still need to pedal of course). The circuit takes the ...
Saturday, July 8, 2017
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Simple Acoustic Sensor
This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note that the sensor...
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Transformerless Power Supply Circuit
This circuit will supply up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance; and it doesn't generate very much...
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USB Converter
Does this sound familiar: you buy a small piece of equipment, such as a programming & debugging interface for a microcontroller, and you have...
Friday, July 7, 2017
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Single-cell Power Supply
Many modern electronic devices and micro-controller based circuits need a 5 V or 3.3 V power supply. It is important that these voltages are...
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Micropower Voltage Regulator
This circuit was developed to power an AVR microcontroller from a 12 V lead-acid battery. The regulator itself draws only 14 µA. Of course,...
Wednesday, July 5, 2017
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Isolated Fuse Fail Indicator
This circuit uses standard components and shows a method of indicating the fuse status of mains powered equipment while providing electrical isolation from the...
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0-30 Volt Laboratory Power Supply
The linear power supply, shown in the schematic, provides 0-30 volts, at 1 amp, maximum, using a discrete transistor regulator with op-amp feedback to...
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Power Supply with High Voltage Isolation
Occasionally you come across some unusual situations when setting up measurement systems. The author once had to set up a system to register the...
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Regulator for Three-Phase Generator
This regulator was designed for use with a generator with a higher output voltage. This type of generator can be found on some boats ...
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Monolithic Step-Down Switching Regulator
L4962 is a monolithic step-down switching regulator. It provides output voltage of 5.1V to maxi-mum 40V, delivering current up to 1.2A to 1.5A, depending...
Saturday, July 1, 2017
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Linear RF Power Meter Circuit
The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used over the frequency range of...
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Green USB switch
Green USB switch Circuit Diagram. According to the Energy Saving Trust, if you add up all the current drawn in standby mode by...
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