Here is a teleremote circuit which enables switching ‘on’ and ‘off’ of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote ...
.. and provide a buffered, low-impedance output at V OUT . In addition, the TLC372's high typical input impedance of 10 12 Ω eliminates any need for an input buffer stage. As Figure 1 shows, the detector's output voltage at the ...
.. cheap to build. You will only need one NTC resistor, one diode and capacitor and serial port connector. Elements: Capacitor 10 uF or more Diode 1N4148 or 1N4001 or similar Thermistor NTC 10k or similar 9 or 25 pin female connector Built device ...
.. exceeds a preset limit. The continuity tester in Figure 1 lets you determine that fact for resistances of 0.5 Ω to 10 kΩ. The heart of the circuit is the transistor pair comprising Q 1 and Q 2 , whose emitters draw current from a ...
.. same arrangement as before is used where a high signal is shown in red and a low signal is shown in green. I have allowed 10 seconds per step in the animation and slightly longer between repetitions so get your bearings during the first 10 ...
.. A), enforcing high linearity and accuracy. To calibrate this circuit apply 7 mV and select the 1.6M (nominal) value for 10 Hz out. Then apply 2.000 V and set the 10k trim for exactly 3 kHz output. Pertinent specifications include linearity ...
.. of analog amplification with opamps, I lowered the AD reference voltage to 1.6 V. This obtains 64 LSB counts for a 10 degrees celcius temperature range, the range used for 0 to 100 % fan speed control. (Click for download)
.. the tedious manual testing. I determined the 0ºC value of my thermistor ThermB to be 22500, with per-degree steps of 10.2 (or 102 with the 10x factor I needed to get around Arduino’s poor floating-point performance). Note: most ...
.. of which is controlled by timing capacitors C1 - C4 and the 10k potentiometer. The tolerance of the capacitors should be 10 % or better for stability. The squarewave is differentiated to produce a triangular wave, which in turn is shaped to ...