CD4069 double channel amplifier ----- CD4069 Linear Amplifier

I use a digital integrated circuit TC4069UB (six-inverter), three common transistors have made a two-channel line amplifier. There is a p-type, n-type two kinds of field effects inside the integrated circuit. If a negative feedback bias resistance is added to the input end of the inverter, the inverter operating point Q is linearly enlarged. District, two field tips are working in the zoom zone. Although this zoom is narrower, the linear degree is slightly poor, but the input impedance is high, the noise is small, the power consumption is low, and the voltage gain is high, and some common circuits cannot match. One: Working principle. The input signal is added to the inverter input by C'r ', R' is an inverter input resistance. The signal after the three-stage inverter is enlarged, and the V 'emitter is output. The V 'emitter resistance value is large, mainly increasing the input impedance of V', and reduces the impact on the pre-stage inverter. C3 except that the inverter output signal is coupled to the base of V ', the inverter is also isolated from V''s DC path. In order to stabilize the circuit, in addition to the negative feedback between the output of the three-stage inverter and the input, the output and input of the final cassette (3 feet and 5 foot) are also connected to the input To make the circuit have a stronger negative feedback effect on the high frequency signal. The regulated power supply consists of V3, DW, and R9, forms a simple series regulator circuit. Second, the component selection element has no special requirements, preferably a 14-foot socket on the printed board to avoid damage to the TC4069UB during welding. V1, V2, V3 β value should be. 1882.50, can be consistent with any type of NPN transistor, L, and R channels. As long as the components are reasonable, no mistake, leak welding, you can use it normally without debugging. Author: 福 福

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