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Posts Tagged ‘current booster’

Increase output current of the op-amp IC LM324 in 85mA size

The op amp output current can generally be in the range of 20 to 40mA.However, the LM324 IC number includes op amp 4 and 3 per parallel.Therefore the output currents up to 85mA, it also has significant short-circuit protection too.
The properties of frequency response time from 0 Hz to 200 KHz, the R1 and C1 are for control of Australian Silk isolates within, and R is the 10 ohms to control the flow of the op amp for each mean much. Every body.

Be the first to comment - What do you think? Posted by admin - May 7, 2011 at 4:29 am

Categories: Op-amp circuit Tags: current booster, increase current, lm324 circuit

booster 10,000x by One Transistor

For a collector follower with emitter resistor, you’ll often find that the gain per stage is no more than 10 to 50 times. The gain increases when the emitter resistor is omitted. Unfortunately, the distortion also increases. With a ubiquitous transistor such as the BC547B, the gain of the transistor is roughly equal to 40 times the collector current (Ic), provided the collector current is less than a few milliamps. This value is in theory equal to the expression q/KT, where q is the charge of the electron, K is Boltzmann’s constant and T is the temperature in Kelvin.

For simplicity, and assuming room temperature, we round this value to 40. For a single stage amplifier circuit with grounded emitter it holds that the gain Uout /Uin (for AC voltage) is in theory equal to SRc. As we observed before, the slope S is about 40Ic. From this follows that the gain is approximately equal to 40I cRc. What does this mean? In the first instance this leads to a very practical rule of thumb: that gain of a grounded emitter circuit amounts to 40·I c·Rc, which is equal to 40 times the voltage across the collector resistor.
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Read more : http://www.extremecircuits.net/2010/05/10000x-with-one-transistor.html

Be the first to comment - What do you think? Posted by admin - March 5, 2011 at 3:00 am

Categories: Basic electronics, Power Amplifier Tags: current booster, simple transistor amplifier circuit, step up booster circuit

Increase the current IC LM7805

Sometimes we want to use. high current at a voltage 5 volts.We can do this by using the voltage regulator IC1 positive constant number 7805.
The Q1 and Q2 of circuit will serve to increase current for IC regulator.The R2 acts as the anti-saturation of Q1 and Q2. Without R2 will allow the two transistors do not work.The output current can be from IC1 alone.R1 specify the bias current to IC1.And the current output of you against too much saturated with. The C1 functions in input power filter to smooth.And C2 serves to prevent interference with the pressure to pay out (Vout).