A circuit arrangement for maintaining constant the current through a variable load V comprises resistors R21, R22 connected in series with the load and a transistor T1 which has its base connected to the junction between resistor R21 and load V, its emitter connected to the junction between ...
The present invention provides a constant current circuit capable of operating on a lower power supply voltage. If a power supply voltage VDD is higher than a sum of a drain-source voltage of a depletion type NMOS transistor (10) Vds10 and a gate-source voltage of the NMOS transistor (15...
The constant current circuit further includes a resistor (58) which is connected at one end to the drain of the first P channel MOS transistor (56) and the gate of the first N channel MOS transistor (60), and at the other end to the drain of the first N channel MOS transistor (60)...
The resistance value needs to take into account the DC gain (hFE) of the transistor which unfortunately varies considerably between transistors of the same type. This means each circuit driving an LED needs to be calibrated manually and the resistance then fixed. The base current is also dependen...
complementary logic 互补逻辑 complementary circuit 补码电路,互补电路 complementary transistor logic 互补晶体管逻辑 complementary logic switch 互补逻辑开关 circuit logic 电路逻辑 相似单词 constant current 直流 complementary a. 1.补充的;互补的;相配的(+to) logic n.[U] 1.逻辑(学);论理学 2....
A perfect constant voltage source/sink is a short circuit (zero resistance) to AC, and Ohm’s law, therefore, ensures that even an infinite AC current passing through it develops zero AC voltage across it. Although active devices such as voltage regulators are frequently better, suitably sized...
1. A constant current circuit, comprising: 2. The circuit recited in claim 1 further including potential switching means connected to said junction point to render said output transistor and semiconductor device concurrently conductive or non-conductive. ...
the relationship between the current I1flowing from said first terminal to said second terminal through said first transistor and the current I2flowing from said first terminal to said second terminal through said series circuit is I1>>I2, and the voltage across said second transistor is made ...
difference across a resistance is equal to the offset voltage of a differentially amplifying circuit which is generated because the current density is different. CONSTITUTION:A constant-current is obtained at a transistor Q8 which is a constant-current source by controlling an electric current IREF ...
1) transistor constant current 晶体管恒流 1. A power supply of continuous solid laser krypton lamp using a new touching off system andtransistor constant currentcircuit is proposed. 介绍一种晶体管恒流全新触发连续固体激光器氪灯电源。 2) BJT-constant current source ...