Free electronic circuit design and schematic diagram
This is a circuit that provide virtual ground that it is required on single-supply operation. This circuit consist of voltage divider and buffer. This circuit generates voltage equal to VCC/2. The voltage divider is bypassed by capacitor. This voltage is generated and buffered by the TLE2426. Here is the schematic diagram of half supply generator provides virtual grounding : To […]
Read more
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 […]
Read more
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 […]
Read more
This circuit is used to prevent the damaging effects of a reversed-polarity battery or short-circuit load. It is used to replace the simple fuse that usually used for overcurrent protection because the fuse has long reaction time and high resistance. This circuit consist of dual comparator, a combination of current amplifier, and external CMOS. A logic-controlled switch can provide low […]
Read more
Diagram below show the typical flyback. This flyback mostly found in a direct view color television or computer monitor. The right side show us the high voltage section. This section consist of HV to CRT, focus, and screen divider network. On monochrome an black-and-white TV, the flyback transformer do not have screen divider and focus. The flyback have a ferrite […]
Read more
A laser diode driver can be implemented using voltage-controlled current source. This simple linear laser diode driver gives cleaner drive current than a switched (PWM) drivers. Here is the schematic diagram of the circuit: A Howland current pump with a current booster is used as the basic of this laser diode driver. Q1 is used as the current booster on […]
Read more
All of the necessary circuitry to optimally control the charge and hold cycle for sealed lead acid battery can be implemented using UC2906 series of battery charger controllers. These integrated circuits monitor and control both the output voltage and current of the charger through three separate charge states; a high current bulk-charge state, a controlled over-charge, and a precision float-charge, […]
Read more