Free Simple Circuit Diagram
Using 567 IC tone decoder/detector, we can build a remote control and or intercom. This circuit can be used to control a relay, or to carry an audio signal (intercom) through power-line wiring. Here is the schematic diagram of this remote control/intercom circuit: The relay will be activated if you inject a 100kHz tone. This can be used to control […]
Read more
This is a TMP01 temperature out-of-range warning circuit. This circuit is used to generate a temperature out-of-range warning signal. This circuit is usually used in sensitive equipment calibrated to work over a limited temperature range. This circuit can be done by connecting the two open-collector outputs of the TMP01 together into a wired-OR configuration. Here is the schematic diagram of […]
Read more
This is a temperature indication and control system using the AD596/AD597. In this system, AD596/AD597 is used as a closed-loop thermocouple signal conditioner. This system uses an external op amp to implement setpoint. The advantages of this system are preserves the alarm function for open thermocouples and provides a high level (10mV/°C) output for the A/D panel meter. Here is […]
Read more
This is a 4 mA TO 20 mA CURRENT LOOP circuit. This circuit is used to transmit a signal over long distances. The accuracy of this circuit is not compromised by voltage drops across the line. This circuit must consume less than 4 mA, because the remote end must receive all of its power from the loop. This circuit require […]
Read more