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 heat.The circuit draws about 30ma AC. Always use a fuse and/or a fusible resistor to be on the safe side. The values given are only a guide. There should be more [...]
USB Interface Based 8051 Microcontroller The project was designed as USB interface with the use of a microcontroller known as Cypress CY7C68013 that is based on 8051 processor. Explanation Aside from being a USB interface, the 8051 processor contains several special functions and built-in peripherals. This interface card would provide an easier connection to the [...]
This power inverter circuit will provide a very stable “Square Wave” Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various “off the shelf” transformers can be used. Or Custom wind your own for best results. Additional MosFets can be paralleled for higher power. It is recommended [...]
Mosfet 300W Audio Power Amplifiers Schematics Mosfet 300W Audio Power Amplifiers Schematics Specification: Maximum Output: 240 watts rms into 8 Ohms, 380 watts rms into 4 Ohms Audio Frequency Linearity: 20 Hz – 20 kHz (+0, -0.2 dB) Closed Loop Gain: 32 dB Hum and Noise: -90 dB (input short circuit) Output Offset Voltage: Less [...]
Fire Alarm Circuit Using LDR Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire.The alarm works by sensing the smoke produced during fire.The circuit produces an audible alarm when the fire breaks out with smoke. When there is no smoke the light from the bulb will [...]
Many fire alarm circuits are presented here,but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight forward so that , it can be easily implemented.The thermistor offers a low resistance at high temperature and high resistance at low temperature. This phenomenon is [...]
High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. The core of this waveform generator is MAX038. This integrated circuit chip gives complete function to build a waveform generator/function generator. The circuit [...]
