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10-Watt Audio Amplifier using LM1875 Schematic Circuit DiagramHere is a simple 10-watt audio amplifier using IC LM1875. The IC has five pins and can deliver a maximum of 18-watt output power depending upon the supply voltage and…
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SIMPLE ELECTRONIC REFLEX GAME SCHEMATIC CIRCUIT DIAGRAMThe circuit is powered by a 9 volt battery installed on the cd4093 schmitt trigger integrated circuit with an integrated and few passive components installed. For beginners, the game is a…
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Keypad Encoder IC with Serial Output Schematic Circuit DiagramThe EDE1144 Keypad Encoder IC from E•Lab Digital Engineering (www.elabinc.com) is designed to interface a matrix-type 4 row × 4 column (16-key or less) keypad to a microcontroller or other…
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SW Converter for Digital AM Car Radio Schematic Circuit DiagramThis circuit is purposely presented with many loose ends (not literally, of course) to stimulate experimenting with RF circuitry at a small outlay. Looking at the circuit diagram you may…
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Alternating Blinker Schematic Circuit DiagramThe circuit represents a general-purpose astable multivibrator that alternatively energizes two heavy loads via a relay (in this case, the loads are 12-V incandescent lamps). In contrast to an ‘analogue’…
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Simple Remote Control Tester Schematic Circuit DiagramNearly always when a remote control doesn’t work, the underlying problem is elementary: the unit does not emit light. The cause may be dry solder joints, defective LEDs etc., but…
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NUMERICAL CIRCUITS LABORATORY EXPERIMENTS SCHEMATIC CIRCUIT DIAGRAMIntroduction to RTL, TTL and CMOS Gates Resistance and Transistor (RTL) Gate Experiment, Introduction and Characteristics of TTL and CMOS Gates, Performing Boolean Functions with Minimum Gates SCHMITT TRIGGERING CIRCUIT Coder, Decoder,…
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Thrifty 2-Hz Clock Schematic Circuit DiagramCMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often require quite a bit of current. We, therefore, propose this oscillator circuit…
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Simple Audio Peak Detector Schematic Circuit DiagramThis audio peak detector allows a pair of stereo channels to be monitored on a single LED. Identical circuitry is used in the left and right channels. Use is made…
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On-Train Radio Camera Schematic Circuit Diagramshould transmit constantly while the train is moving and continue transmitting for a few minutes after the train stops. But if the train starts up again after a relatively long…
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NiMH Charger for up to six Cells Schematic Circuit DiagramIt is impossible to imagine a present-day society without any batteries. Count the number of gadgets in your house that are powered by batteries, you will be stunned by the…
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On/Off Button Schematic Circuit DiagramIt features at least once in every Small Circuits collection: the 555 timer. In this simple circuit we give the chip a little more attention than usual (refer to ‘The…
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Unusual LED Blinker Schematic Circuit DiagramThis LED blinker manages with only a few components and is dimensioned to operate from an ac supply in the range of 4–16 V (6–24 V dc). As its current…
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Car Central-Locking System Schematic Circuit DiagramFor a few pounds, you can buy a kit from any automotive accessory shop that will allow your car to be fitted with a central locking door system. Such a…
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Dimmer with a MOSFET Schematic Circuit DiagramThis circuit shows that dimmers intended for use at mains voltage do not always have to contain a triac. Here, a MOSFET (BUZ41A, 500 V/4.5A) in a diode bridge is…
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Negative Auxiliary Voltage Schematic Circuit DiagramSome circuits need a negative supply voltage that only has to supply a small current. Providing a separate transformer winding for this (possibly even with a rectifier and filter capacitor)…
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Attitude Sensor Schematic Circuit DiagramThe circuit presented here (in two versions) uses a light barrier as a position sensor. In the first version (Figure 1), the light barrier consists of an LED (D1) for…
