Temperature-Control | Electronic Project Circuits

Posts Tagged ‘Temperature-Control’

Temperature Controller with U217B

A triac controller for switching resistive loads directly from the mains supply using the zero crossing technique. The device is powered directly from the mains via a diode and dropper resistor, and the IC has its own regulator to limit its supply to 9.25V. To ensure that no switching occurs outside of the zero crossing point, full wave logic is employed to guarantee that complete mains cycles only are switched to the load.

Source: http://www.next.gr/inside-circuits/
Temperature-Controller-with-U217B-l5865.html

Be the first to comment - What do you think? Posted by admin - November 20, 2008 at 5:47 am

Categories: Electronic Control Tags: Temperature-Control, triac circuit

Thermal Fan Controller by IC 741 and Diode

The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. I designed this circuit to use 12V computer fans, as these are now very easy to get cheaply. These fans typically draw about 200mA when running, so a small power transistor will be fine as the switch. I used a BD140 (1A, 6.5W), but almost anything you have to hand will work just as well.

Read more original source: http://sound.westhost.com/project42.htm

Be the first to comment - What do you think? Posted by admin - October 25, 2008 at 4:15 am

Categories: Detector, Electronic Control Tags: IC741, temperature diode sensor, Temperature-Control

Warn the heat in an automobile

This circuit sets up in its automobile will perform to warn give testimony know before your car is will born the heat too much. By use main part electronic be IC 741 and Thermistors. By have LED Flasher with usual rate , when the temperature arrives at location value keeps with before VR1. When the temperature increases continuously LED as a result stick bright forever. By control checking temperature has with VR2. This circuit gives with power supply of an automobile has normally for the frequency of winking can fix with C1. A friend can see the detail adds in the circuit.