Archive for October, 2008
2008 October 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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Frequency converter
Oct 12th
This is a 35.3 to 10.7 MHz converter circuit. It converts the 35.3 MHz signal coming from a VHF/UHF tuner down to an FM tuner to decode the TV audio in FM quality. The IC being used (TBA120) is one of the most common components in radio and TV circuits. Although it was designed as an RF amplifier and FM demodulator, it can also be used for many other applications. (more…)
Analog switch circuit
Oct 12th
This analog switch circuit is designed to switch on or off and analog line. it consists of two analog switches in IC form that are controlled by two pushbutton switches. In standby mode the voltage at the control pins of the analog switches is low. (more…)
NiCad Battery Charger
Oct 5th
This NiCad baterry charger circuit schematic can charge 6 volts as well as 12 volts NiCad batteries. It uses a transformer which can deliver 4 to 5 A current between 12.6 and 15 V. Ordinary chargers select the charging voltage through a swith but the circuit featured here uses an automatic current regulator. (more…)
Sensitive FM Tuner
Oct 5th
This FM radio tuner is the right circuit for hobbyists who want to build their own tuners instead of buying a “plug-n-play” finished product. The fm tuner circuit is designed with only 3 transistors. The amplification is around 40 dB. The first transistor works as an RF amplifier. The second transistor is the mixer. (more…)
Coffee thermometer
Oct 4th
Why measure the temperature of the coffee? Well, coffee taste depends on two things. First, how strong the coffee is and second, how hot it is. The second criterium is quite easy since most of the coffee drinkers prefer to have it hot, that is, around 80 degrees centigrade. Since not everybody has a built-in thermometer in his tongue, the circuit featured here is very useful to save you from burning your tongue. (more…)
Temperature alarm
Oct 4th
This temperature alarm circuit continuosly monitors the room temperature and beeps when the temperature drops below 20 degrees centigrade. This capability to constantly monitor the room temperature can help lower your air-conditioning costs by reminding you to turn off your airconditioner. An optical display like a thermometer has a limited effectivity since it can be easily overlooked. A tone signal on the other hand is not easy to ignore. (more…)
Intercom circuit
Oct 4th
If you compare this intercom circuit to modern FM and wireless designs, you will certainly sau it outoded. The intercom schematic fulfills its tasks – to provide a reliable communication line and is very simple to construct. The circuit is made up of an amplifier, two switches and two loudspeakers. (more…)
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