Archive for November, 2008
2008 November circuits - related electronic projects and circuit diagrams (schematics), this helps you finding desired informations and facilitates your site navigation through all articles database.
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Robot Voice Generator
Nov 30th
Those of you who imagine that a robot voice generator box would require a whole heap of ICs are mistaken; the ISD2500 ChipCorder family of ICs from Winbond contains almost all the necessary hardware in a single IC to record and playback audio messages. Included on the IC is a microphone preamp and AGC suitable for a low-cost electret type microphone, an output amplifier to drive a loudspeaker, memory, an oscillator, an A/D and a D/A converter. (more…)
Overheat Detector Alarm Switch
Nov 30th
At the heart of this overhead detector (fire alarm) circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. This can be used as part of fire smoke detectors but do not use it as a home fire alarm system. The LM35 develops an output voltage of 10 mV/K change in measured temperature. Designed to draw a minimal current of its own, the LM35 has very low self heating in still air. (more…)
LED Christmas Lights
Nov 30th
Have your already set up a Christmas tree in your house and decorated it with traditional lights? Build a couple of these blinking Christmas decorations to enhance the Christmas mood. The coloured LEDs blink in a seemingly random sequence and rate and create a festive appearance. (more…)
3 volts Car Adapter
Nov 29th
This 3 volts Car Adapter circuit is based on a standard LT1074CT switching regulator IC. The schematic shows the LT1074CT used as a positive step-down or ‘buck’ converter.
The ‘switcher’ is used to convert a +12-volt car battery voltage down to +3 volts for use with the personal hi-fi’s and handheld games for the author’s two boisterous children on long car journeys. Note at under ten years of age, children will rarely be hi-fi aficionado’s and are generally not concerned with any noise generated by the ‘switcher ‘circuit.
Read the rest and view the 3volt car adapter circuit (more…)
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Electroscope – Measure electrostatic charge
Nov 29th
This circuit can precisely measure electrostatic charge. The charge to be measured is stored on C1 (a high quality MKT capacitor with a value of 1-2 μF). The voltage (U) across the capacitor (C1) is elated to its charge (Q) by the equation U = Q/C1. Operational amplifier IC2 buffers this very high impedance source. An input lead is connected to one side of capacitor C1 and terminated with a test probe. The other side is connected to an earth lead and to a convenient earth point. IC3 amplifies the low voltage level at the output of IC2 and drives More >
Electronic Stethoscope
Nov 29th
An electronic stethoscope is used to listen to your heartbeat and you would normally use a listening tube or stethoscope. This electronic stethoscope circuit uses a piezo sounder from a musical greetings card or melody generator, as a microphone. This transducer has an output signal in the order of 100 mV and its low frequency response is governed by the input impedance of the amplifier. (more…)
Acupuncture point locator
Nov 2nd
This acupunture point locator circuit is used to locate the sensitive acupuncture points location on the human body. Acupuncture belongs to the traditional alternative medicine. This healing method require the knowledge of the correct location of the important ponts of the body. Traditional acupuncture specialists rely on their expert knowledge to locate these points. (more…)
LF356a datasheet
Nov 2nd
LF356a General Description: These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET™ Technology). These amplifiers feature low input bias and offset currents/low offset voltage and offset voltage drift, coupled with offset adjust which does not degrade drift or common-mode rejection. The devices are also designed for high slew rate, wide bandwidth, extremely fast settling time, low voltage and current noise and a low 1/f noise corner. (more…)
TDA1013B
Nov 1st
TDA1013B is a 4 W audio power amplifier with DC volume control. The TDA1013B is an integrated audio amplifier circuit with DC volume control, encapsulated in a 9-lead single in-line (SIL) plastic package. The DC volume control stage has a logarithmic control characteristic with a range of more than 80 dB; control is by means of a DC voltage variable between 2 and 6.5 V. The audio amplifier has a well defined open loop gain and a fixed integrated closed loop. This device requires only a few external components and offers stability and performance. (more…)
AVC Automatic Volume Control
Nov 1st
AVC – The featured circuit controls a volume line automatically. It delivers an output voltage of approximately 4 volts peak to peak. This voltage remains relatively constant by input voltages ranging from several hundred milivolts to serveral volts. (more…)
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