Analog Multiplier-Divider with 4136 Op-Amps
This unique circuit below can be used as divider and multiplier. This circuit is formed by all four sections of a 4136 . The Q1 through Q4 can be any PNP transistor, but that must matched transistors. The transistor matching determine the acurracy of the divider and multiplier circuit. Here is the schematic diagram of …[Read More]
30-Khz Bandwidth High Linearity Opto-Isolated Amplifier
Using optocoupler to directly transfer a linear (analog) voltage would produce a large unpredictable linearity error, which is also sensitive to temperature changes. By using frequency modulation, the total system’s linearity will depend only on the linearity of the V/F and F/V converter, which is fortunately cancel each other if we use similar devices with …[Read More]
This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car’s LED light show. The Q1 amplify the audio from mic. The R1 is used to adjust the peak of signal to greater than about 0.7 volts, …[Read More]
Selectable Voltages 6V, 9V, and 12V Linear Voltage Regulator
We can build a multiple voltage power supply 6, 9, and 12V (AC-DC Adapter) with the circuit shown in the following schematic diagram. Not only provide multiple voltage output with single voltage supply, this circuit add the benefit of regulating the voltage for better stability. The TIP31 transistor should be installed with proper heat-sink …[Read More]
Digital Encoder Circuit Using Stepper Motor
Using circuit depicted in the schematic diagram below, the direction and shaft rotation of stepper motor can be seen on the LED display. Alternative to digital rotation encoder as a digital encoder input, this circuit uses a stepper motor. Here is the schematic diagram of the circuit:
Wideband Buffer using FET and Bipolar Transistor
The schematic diagram shown below is a wide-band buffer circuit. This circuit is formed by FET and transistor. This circuit consist of series-feedback buffer which act as wideband unity-gain amplifier. This wideband unity-gain amplifier has high input impedance due to the low input impedance of 2N5485 FET. Here is the schematic diagram of the circuit: …[Read More]
Compressor Circuit with 570/571 Compandor IC
Compressor circuit provide high gain for low amplitude input and provide low gain for high amplitude input. This action, in effect, produce a nearly constant amplitude even though the input has very high dynamic range (very high amplitude variation from time to time). The action of compression like this is needed in some situation, such …[Read More]
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