Circuit Lake » circuit

Low Cost Universal Battery Charger

admin — Wed, 19 Oct 2011 20:41:19 +0000

This circuit allows you to transform a mains adapter in to a charger for NiCd – NiMH batteries. With selectable charge current (50mA-400mA), the charger can be used to charge cellular phone, toys, portables gadget, video batteries, MP3 players etc. Supply voltage input starting from 6.5VDC to 21VDC (depending on used battery). The circuit [...]

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Gas Leakage Alarm

admin — Sat, 15 Oct 2011 01:33:56 +0000

Here is a circuit that can be used to detects the leakage of LPG gas and alerts the user through audio-visual indications. The circuit uses SEN-1327 gas sensor module from RhydoLABZ. Its output goes high when the gas level reaches or exceeds certain point. A preset in the module is used to set the [...]

IR Remote Switch for Home Appliance

admin — Thu, 13 Oct 2011 00:57:33 +0000

If you are looking for simple ON-OFF remote switch for your home appliance then this InfraRed remote control circuit is suit for it. This circuit allows you to turn on/off your home appliance (lamp, ran, radio, etc) using any type TV, VCD or DVD remote control with range up to 10 meters. The circuit is [...]

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Capacitor ESR Tester

admin — Sun, 06 Mar 2011 19:45:24 +0000

ESR (equivalent series resistance) is one of the characteristics that define the performance of an electrolytic capacitor. Low ESR is highly desirable in a capacitor as any ripple current through the capacitor causes the capacitor to heat up due to the resistive loses. Typical capacitor checker measures the capacity of the test capacitor. Some advanced [...]

Fast 7.2V NiCad Battery Charger

admin — Thu, 01 Jul 2010 22:09:29 +0000

This battery charger built using IC MAX713, a NiCad battery charger IC from Maxim. It will control the fast charge time and monitor the cell voltage. The project can charges a battery approximately 80% charge in 22 minutes at a current of 2.4 Amps. Once the fast charging has ended, it trickle charges the battery. click [...]

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Oscillator Project Using ICL8038

admin — Wed, 17 Feb 2010 22:26:53 +0000

The circuit is a easy design an Oscillator. The main component consists of the VCO (ICL8038), the CMOS-compatible output stage using the MOSFET driver chip ICL7667 and the sine and triangle output stage (LT1210). It is capable of producing sine, triangle and square wave output with a frequency up to several hundred kHz. [...]

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Simplest Radio Frequency Transmitter

admin — Mon, 23 Mar 2009 03:10:14 +0000

This is may be the simplest radio transmitter that you will find anywhere. lt has a total of fiye parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission is useful. lt runs on 1.5 to 3 yolts, with small [...]

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