current source a current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it a current source is the dual of power led s simplest light with constant current circuit here s a really simple and inexpensive $1 led driver circuit the circuit is a "constant current source" which means that it keeps the led brightness design lm317 constant current source circuits also see lm317 high power constant current source circuit a constant current source ccs in electronics is a device circuit that produces a constant value of constant current source with operational amplifier this circuit achieves its constant current through the use of the op amp and the transistor the first two resistors r1 and r2 are used as a voltage divider constant current diode constant current diode is an electronic device that limits current to a maximal specified value for the device it is known as current limiting diode cld current current source with floating load ecircuit center current source with floating load circuit curr src1 cir download the spice file getting optimum performance in 1 200 transistor circuits talking electronics introduction this e book contains 100 transistor circuits the second part of this e book will contain a further 100 circuits most of them can be made with telephone in use relay lm317 regulators lithium charger lm317t voltage regulator with pass transistor the lm317t output current can be increased by using an additional power transistor to share a portion of the total current part ia linear circuits and devices a current source part ia linear circuits and devices a current source based on a jfet in lecture 1 we introduced the idea of a current source and mentioned that these were slightly chapter 11 the current mirror [analog devices wiki] the implementation of the current mirror circuit may seem simple but there is a lot going on the simple two transistor implementation of the current mirror is based

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