Circuit Lake

Electronic Project and Circuit Collection


Fast Portable USB Charger, SuperBoost

January 24, 2013 By: admin Category: Analog, Tools, USB No Comments →

This project is inspired by the simple usb charger, Minty Boost. It helps you to re-charge your mp3 player, camera, cell phone, and just about any other gadget you can plug into a USB port with faster rate than minty boost. Instead using LT1302 chip with limited to 600mA, it uses LM2700 from National which […]

Single Li-Ion / Li-Polymer Battery Charger

January 23, 2013 By: admin Category: Analog, Basic No Comments →

The MCP73837 and MCP73838 based charger is suitable for portable applications. It is fully integrated linear Li-Ion / Li-Polymer battery chargers with autonomous power source selection. It has small physical size and only need low number of external components to make it works. The MCP73837 support Power-Good Monitor while MCP73838 has Timer Enable feature.

One IC FM Radio Receiver based on TDA7000

October 21, 2012 By: admin Category: Analog, Miscellaneous, Wireless No Comments →

This simple FM receiver is built based on IC TDA7000 with minimum passive component. It can receive entire 88 – 108MHz FM band with good sensitivity. A nice feature of this TDA7000 FM receiver is a voltage controlled oscillator. Instead of using trimmer (variable capacitor), you can tune the frequency by varying the input voltage […]

Low Dropout Adjustable Power Supply

October 19, 2012 By: admin Category: Analog, Power Supply No Comments →

This adjustable breadboard power supply is built based on IC MIC2941. It has very low dropout only 40mV – 400mV compared to 1.25V – 2.0V for LM317, which means your output voltage can be much closer to the input voltage. The power supply can deliver guaranteed 1.25A output.