Showing posts with label current. Show all posts
Showing posts with label current. Show all posts
Monday, September 8, 2014
Build a Current Booster Wiring diagram Schematic
This is a simple Current Booster Circuit Diagram. The LT1012 corrects de errors in the booster stage, and does not set high-frequency signals. Fast signals are fed directly to the stage via Q5 and the 0.01-uF coupling capacitors. De and low-frequency signals drive the stage via the op-amp`s output.
The output stage consists of current sources, Q1 and Q2, driving the Q3-Q5 and Q4-Q7 complementary emitter follows. The diode network at the output steers drive away from the transistor bases when output current exceeds 250 mA, providing fast short-schema protection.
Current Booster Circuit Diagram
The schema`s high frequency summing node is the junction of the 1-K and 10-K resistors at the LT1012. The 10 K/39 pF pair filters high frequencies, perruitting accurate de summation at the LT1012`s positive input. This current-boosted amplifier has a slew rate in excess of 1000 Vii`s, a full power bandwidth of 7.5 MHz and a 3-dB point of 14 MHz.
Wednesday, August 27, 2014
Ni Cd and Ni MH Adjustable constant current Wiring diagram Schematic
This is a battery charger schema with adjustable current for Ni-MH or Ni-Cd. It can be used for a constant current power, which can be set to any value from a few milliamps to about 500 mA. The maximum current is 500 mA, because that is the limit of transistor BC140. The input voltage must be above 5.25V output voltage, this is due to losses as 1.25V current limit and approximately 4V regulator.
Battery Charger Ni-Cd and Ni-MH Adjustable constant current Circuit Diagram
Battery Charger Ni-Cd and Ni-MH Adjustable constant current Circuit Diagram
The LM317 regulator is used, it should have a sink.
Components
R1 100Ω resistor
VR1 trimpot or potentiometer 500Ω
Capacitor C1 0.1μF
C2 Capacitor 0.01μF
Diode D1 1N4001
Q1 Transistor BC140
IC1 Voltage Regulator LM317
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