Simple Bilateral Current Source Wiring diagram Schematic

The Simple Bilateral Current Source Circuit Diagram will produce the current relationship to within 2% using 1% values for Rl through R5. This includes variations in Rl from 100 ohm to 2000 ohm. The use of large resistors for Rl through R4 minimizes the error due to Rl variations. The large resistors are possible because of the excellent input bias current performance of the OP-08,.

Simple Bilateral Current Source Circuit Diagram

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Build a Bootstrapped Amp Current Source Wiring diagram Schematic

Build a Bootstrapped Amp Current Source Circuit Diagram. This schema responds to the difference between Vj and V2. Rq on sets gain. Resistors XR2 and (1 -X) R2 produce the bootstrap effect. These two resistors convert the schema`s output voltage to a current. IC1 and IC2 are Burr-Brown OPA2107 or equal.

Bootstrapped Amp Current Source Circuit Diagram

Build a Bootstrapped Amp Current Source Circuit Diagram

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Non Switching Current Drive Amplifiers

Non-Switching Amplifiers

Most of the distortion in Class-B is crossover distortion, and results from gain changes in the output stage as the power devices turn on and off. Several researchers have attempted to avoid this by ensuring that each device is clamped to pass a certain minimum current at all times. This approach has certainly been exploited commercially, but few technical details have been published. It is not intuitively obvious (to me, anyway) that stopping the diminishing device current in its tracks will give less crossover distortion .

Current-Drive Amplifiers

Almost all power amplifiers aspire to be voltage sources of zero output impedance. This minimizes frequency-response variations caused by the peaks and dips of the impedance curve, and gives a universal amplifier that can drive any loudspeaker directly.

The opposite approach is an amplifier with a suffi ciently high output impedance to act as a constant-current source. This eliminates some problems – such as rising voice-coil resistance with heat dissipation – but introduces others such as control of the cone resonance. Current amplifiers therefore appear to be only of use with active crossovers and velocity feedback from the cone . It is relatively simple to design an amplifier with any desired output impedance (even a negative one), and so any compromise between voltage and current drive is attainable. The snag is that loudspeakers are universally designed to be driven by voltage sources, and higher amplifier impedances demand tailoring to specifi c speaker types

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1 Amp Current Injector Wiring diagram Schematic

This is a Simple 1 Amp Current Injector Circuit Diagram. A voltage booster provides the current control schema with a higher voltage, to insure the electronic schema operates properly, even as the battery voltage drops. A single LED provides both power monitoring and a low battery indicator. The current source is activated when a pushbutton switch is pressed. With a good digital voltmeter, you can use this device to measure resistances down to less than one micro ohm. 

 Simple 1 Amp Current Injector Circuit Diagram

That is 0.000001 ohms. I often use it to measure contact resistance of a relay or the resistance of big chunk of heavy gauge wire or the resistance of a copper trace on a schema board. You can also use it to measure the voltage drop of a power diode, when conducting one amp of current. 

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