Simple Electric Circuit The Simple Electric Circuit will help you to learn the basic concepts of electricity and electrical circuits.
For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink. However, we often forget about an equally important item and that is how to keep our rigs cool during those long winded summertime QSO's.
Is it any wonder that those RF power amplifier modules have such a high failure rate? If you own one of those older radios designed before manufacturers finally realized that cooling fans were really needed, help is at hand.
|TDA Amplifier Circuit (12V Stereo 30W) - Electronics Projects Circuits||Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such switches is so long that is not possible to immediately localise a short that occurs while the trains are running, for example. Furthermore, bimetallic protection switches do not always work properly when the voltage applied to the track circuit is relatively low.|
|Connection diagram TDA7377 PCB||Amplifiers This is a second revision of 50W LM power amplifier that is used to power two bookshelf speakers. The sound produced by LM chip is excellent so I decided to make another amplifier with it.|
The circuit in figure 1 is a thermal cooling fan controller designed around the famous op amp and a simple thermistor.
This circuit will control a 12 volt fan requiring as much as MA of current.
The thermistor is used as a sensor which turns the fan on whenever the temperature exceeds 88 F. Many of the 12 volt CPU cooling fans will work just fine. Simply attach the cooling fan to the rig's heat sink and place the sensor so that it is in physical contact with the heat sink but not in the fan's air flow.
Use tie wraps or some other suitable means to mount the fan and sensor. Experience has shown that soldering can damage or alter the characteristics of the thermistor.
Use Butt type crimp connectors to prevent damage from soldering. The thermistor, R1, is really the heart of this circuit. At 70 F, the thermistor has a resistance of about 10, ohms.
As the thermistor heats up, it's resistance decreases until the voltage threshold determined by R4 is reached. At this time the output of the op amp goes from high to low causing transistor Q1 to be saturated and allowing current to flow through the emitter to the collector.
Capacitor C1 acts as a filter capacitor reducing fan noise as well as providing a capacitive start for the motor. Do not omit C1 in this circuit. The value of C1 may need to be increased if fan noise becomes audible in your rig's receiver.
If you would like the fan to turn on at a different temperature or can't find an 8.Open-source electronic prototyping platform enabling users to create interactive electronic objects.
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Get good knowledge on circuit diagrams of various electronics mini projects by visiting this page. Visit this page regularly for latest updates of projects.
rutadeltambor.com is introducing some simple LED circuits and projects which can be done even at home. These circuits and projects have already been tested and published along with circuit diagram, schematics, and a detailed working description for each one of them.
Here is a collection of 11 circuit projects from EFY vault. These handpicked projects are fun to design and can be used around the house. Make them now. See Many electronic circuits, Mini Projects so easy to make with PCB, Eg: Power supply,Amplifier,inverter,charger and more, Electronic Learning, DIY, TIPs, How to.
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