DATASHEET and Circuit Diagram

Automotive Tachometer application using LM1819 air-core generator with on-chip norton amplifier and NPN transistor is shown in the herein circuit diagram. LM1819 is a 12V air-core meter generator with self-centering 20 mA outputs which commonly applied in applications such as air-core meter driver, automotive tachometer, and ruggedized instruments – according to the LM1819 datasheet.

This automotive tachometer application circuit diagram shown operates with 4 cylinder engine and deflects meter pointer (270 degree) at 6000 RPM.
LM1819 Automotive Tachometer Application Circuit Diagram and Datasheet continued »

This simple aerial booster circuit design might be an alternate or a hobby project for making such an aerial booster device for the Citizen Band (CB) radio. Although modem communications equipment mostly operates efficiently on the higher frequency bands (which includes the 27MHz FM Citizens Rand), performance at these frequencies is not all one would desire in many cases, and there is room for improvement.
Aerial booster circuit sample design has preset tuning, although it could be easily modified to have a tuning control if desired. However, the 27MHz aerial booster circuit is only some 390 kHz wide, and the bandwidth of the amplifier is just about sufficient to give very good results over the entire band if it is peaked at the centre of the band.
Aerial Booster Circuit Diagram for Citizens Band Project continued »

A suitable 12V portable and mobile power supply circuit design is shown in the circuit diagram below. This type of power supply can be built quite inexpensively and needs only a minimum of circuitry. This circuit will give output current of 1 amp, well stabilized and smoothed.

The smoothing and regulation is provided by IC1 7812 which is a 12V monolithic voltage regulator. This portable power supply unit incorporates output current limiting and is therefore not damaged by accidental short term short circuits or other forms of output overloading.
12V Portable and Mobile Power Supply Circuit Diagram continued »

This is a versatile mini amplifier circuit, a mini amplifier and loudspeaker combination which can be used with a tremendous savings. This mini amplifier requires only a single LM386 IC, a loudspeaker and eight other components. If measured, requiring only two inches square, 200 mWatt output, or more. If it does not fit, its gain can be preset.

The circuit is very simple. Work is based on IC1 (LM 386) which produces a kind of variation in the specification provide an important distinction, power output and power supply voltage which is a significant factor. 200mWatt Super Tiny Amplifier using LM386 Circuit Diagram continued »

This stereo headphone amplifier device may provide up to ten channels of headphone monitoring if a 1/4” Link Input/Output jack is provided for connecting two RA53 units together. The schematic below illustrates a possible operation for this RA53 stereo headphone amplifier.

As you can see, the headphones are connected to the outputs on the front panel side, when the others to the rear panel. Another connection possibility can be:
RA53 Stereo Headphone Amplifier Connection Schematic continued »

The schematic above shows a simplified application of MC3309 Alternator Voltage Regulator. It is designed with level shifting resistors for controlling voltage in 12V three-phase alternator with a rotating field winding automotive system.

The use of MC33099 in automotive provides Alternator’s Load Response Control at low engine RPM to eliminate engine speed hunting and vibration. The MC330099 also generates analog or digital duty cycle control of ON/OFF ratio of the alternator at fixed frequency.