Free electronic circuit design and schematic diagram
This is a programmable voltage regulator circuit. With this circuit we can generate a voltage according to our wishes. This circuit uses L200 IC. Here is the circuit : Potentiometer R2 is used to fix the output voltage Vo. Following equation show value of the output voltage: Vo=Vref (1+(R2/R1)) We can obtain a wide range of fixed output voltage by […]
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This is a simple circuit of programmable current source/regulator. This circuit is used to generate current. Here is the schematic diagram of programmable current source/regulator : This circuit uses L 200 as main component. The error amplifier of this circuit is disabled by shorting pin 4 to ground. The value R is used to fix the output Io : Io=(V5-2)/R […]
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This is a Programmable Levels High Speed Pulse Generator circuit. This circuit consist of Lilliputian dimensions associated with the sub-micron geometries of many analog and most digital processes also advanced CMOS logic gates or analog comparators. Here is the circuit : The advanced CMOS logic gates or analog comparators is used to create faster digital edges. The sub-micron of digital […]
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This is a simple sawtooth generator circuit. The advantages of this circuit are low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. Here is the circuit : A voltage-controlled current source is formed by IC1 with R1 and Q1. The C1 is discharged by current […]
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This is an application that can be used to adjust LED brightness while maintaining superior color quality. This application uses pulse width modulation (PWM) dimming technique. This application can be used for single-line scrolling displays, transportation road signs, simple scoreboards, ever-expanding advertising markets encompassing convenience gas stations, shops, stadiums, and stores. Following figures shows color shift caused by analog dimming, […]
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This is a circuit of differential analog switch. This circuit uses the FM1208 monolithic dual. Here is the circuit: This circuit is ideal choice for an accurate multiplexer because RDS (on) for the monolithic dual tracks at better than ± 1% over wide temperature ranges (-25 to +125°) although it is unusual. [Source: National Semiconductor Application Note]
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This is a circuit of self-writing LED display sign controller. This circuit consist of eight power shift register which are installed in cascade. The shift registers are used to turn on a string of 64 lamps or LEDs sequentially. Here is the circuit : When the shift register clock (SRCK) is clocked, the register is clocked, so that the display […]
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