Advertisement
Touch detecting Switches – Circuit Schematic
Touch detecting Switches
One of the unusual features of the out-of-production Programmable Drum Set was its use of touch switches for control. Like most touch switches, these detect the...
Light/dark relay switch – Circuit Schematic
Light/dark relay switch
This kit is the most basic, practical circuit to build using an LDR to turn on a relay. The two transistors connected as a Darlington pair give the circuit en...
LM1881 circuit – Circuit Schematic
LM1881 circuit
This is quite a nice chip, and has myriad uses, but we only need it to perform one function here. Since most game systems output the composite sync information ...
Infrared motion detector – Circuit Schematic
Infrared motion detector
The GLMDA is designed to detect the motion of a human or animal both in daylight and at night and to provide a normally open relay output that can be used to ...
Temperature Control switch – Circuit Schematic
Temperature Control switch
This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polariz...
Voltage window switch – Circuit Schematic
Voltage window switch
A voltage window switch is in practice the basic lower window limit of this circuit is roughly 3V and the upper limit is 9V. The window range can be extended by...
Temperature limit Relay – Circuit Schematic
Temperature limit Relay
This circuit, is basically a resistance ? sensing window switch, except that the ?resistor? takes the form of an NTC thermistor and the circuit thus responds to...
Light Detector circuit – Circuit Schematic
Light Detector circuit
This circuit give low level output, when exist enough lighting, that is a detector of light. It can give, say ,command turn on somebodies lights, when fall the ...
Ultrasonic / Bat detector – Circuit Schematic
Ultrasonic / Bat detector
I have found this circuit to have better sensitivity, both in distance to a visible bat and in audio frequency, than some other published circuits using a 40kHz...
Electromyogram Monitor – Circuit Schematic
Electromyogram Monitor
Electrical potentials are generated by muscle when there is movement. This Signal can be pick up by electrode to form EMG. For my Final Year Project, I did an a...
Sobriety Tester with LM3914 – Circuit Schematic
Sobriety Tester with LM3914
With all the holidays upon us, understandably some of us will be drinking alcoholic beverages. This circuit can be used as a guideline how much you have had to ...
Simple Soil Moisture Meter with 741 – Circuit Schematic
Simple Soil Moisture Meter with 741
Stick the metal probes into a freshly watered plant and adjust R5 for a mid-scale meter deflection. The meter will monitor the soil wetness and the meter will i...
Self-Powered Solar Data Logger – Circuit Schematic
Self-Powered Solar Data Logger
My project is a self-powered solar data logger. Put out in the sunlight, it will measure the light level and log this to memory to be later downloaded to a com...
InfraRed Detector (PIC12F629) – Circuit Schematic
InfraRed Detector (PIC12F629)
This unit uses one TSAL6100 IR/LED emitter from Digi-Key. This IR diode has a narrow (10 degree) radiation pattern at 940 NM. It is driven via 2n2904 transistor...
Mains Voltage Checker – Circuit Schematic
Mains Voltage Checker
This is a CMOS IC (CD4033) based circuit which can be used to detect presence of mains AC voltage without any electrical contact with the conductor carrying AC ...
Sensitive Electrostatic detector – Circuit Schematic
Sensitive Electrostatic detector
This simple circuit can detect the invisible fields of voltage which surround all electrified objects. It acts as an electronic "electroscope." Regular foil-lea...
Simple Day/Night switch (40106B) – Circuit Schematic
Simple Day/Night switch (40106B)
This is a simple circuit that does the day/night switchings you have in mind. POT1 is used to set the light level at which the circuit switches from enable to d...
Thermometer with a LM335 – Circuit Schematic
Thermometer with a LM335
The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is 10 millivolts per degree C, with 25 degrees C corresponding to 2.982...
Weather station – Circuit Schematic
Weather station
This 1-Wire MicroLAN [1] uses a capacitor and diode half-wave rectifier to provide parasitic power from the data line for the station's various sensors and to t...
Plants Humidity Sensor – Circuit Schematic
Plants Humidity Sensor
IC1D is a CMOS Schmitt trigger oscillator at about 2KHz. It starts and continues to oscillate with a supply down to 1.24V (the lowest output voltage of my LM317...