Free electronic circuit design and schematic diagram
It’s common if Air conditioner is found in every house In hot country because it’s difficult to survive in hot country without Air conditioner. Air conditioner is an electronic tool that is used to regulate the temperature in the room. This video shows how the air conditioner works. The basic idea of air conditioner is evaporation with a liquid evaporates […]
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This schematic diagram shows an LM1893 powerline modem circuit. This circuit is used to transfer information between remote location by using the power mains. This circuit uses LM1893 that is used as a power line interface for half-duplex (bi-directional) communication of serial bit stream of virtually any coding. Here is the schematic diagram of the circuit : To give maximum […]
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This bass booster circuit can be used filter the input signal as part of internal circuit of an active subwoofer circuit. This circuit is not only boost the bass (low) frequency, but also attenuate high frequency as well. You might consider this circuit as low pass filter, since the high frequency response is not flat, not really as expected in […]
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This is Infra-Red Remote Control Tester circuit. This circuit is used to test go/no-go of any remote control transmitting infra-red (IR) light. The supply of this circuit is 3V battery. This circuit has some advantages, such as fits in a compact enclosure, built from inexpensive parts and a handful of commonly available. As a quasi-analogue amplifier, this circuit uses Schmitt […]
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You might find op-amp based active virtual ground, but here a schematic diagram shows that you can build such circuit using discrete components. This circuit uses most any complementary pair of small-signal transistors such as PN2222A and PN2907A. The diode that is used in this circuit is generic small-signal types like 1N914. You can also use other transistor type as […]
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This is a Low Cost Universal Battery Charger Circuit. This circuit is used to charge NiCD-NiMH batteries and ideal for car use. This circuit transforms a mains adapter to a charger. It can be used to charge MP3 players, portables, toys cellular phone, video batteries. This circuit also has selectable charge current. To indicate this device is charging, an LED […]
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This motor driver circuit control the charging and power delivery cycles to enable small solar cell to drive dc motor. Here is the schematic diagram of the circuit: You have to make sure that 4700uF cap doesn’t leak, for more information about this solar cell dc motor driver circuit, you can see here.
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