When you are connected to buffer a tester to outside tool, we should have an booster with enough bandwidth and power disposition ability. This circuit is a very simple for unity gain buffer; it is only two pairs of emitter followers. The base emitter voltages of Q1 and Q2 cancel out, and so do those of Q3 and Q4. The preset is used to zero out any small dc offsets due to mismatching in the transistors.       It has reasonably high input impedance, 50 ohm output impedance, a wide bandwidth and high slew rate. Related links Voltage buffer circuit Analog buffer circuit Transistor driver circuit PC serial port buffer Output buffer by IC 4050 Buffer op-amp by IC LM741 Class A Buffer preamplifier by BC550

High Q notch filter       In the circuit Figure 1 shown, Twin-T network connections with LM102 in form of High Q notch filter.       Usually, the junction of R3 and C3 to ground, is bootstrapped to the output of the follower.       Because it has a very low impedance,neither the depth nor the frequency of the notch change. However, Q increases in proportion to the amount of the input feedback signal to the R3 and C3, the response of the twin-T and the response to the follower input. 60Hz Notch Filter by LM741 In the Figure 2 sometimes when want to decrease especial frequency noise that want only. This circuit can help you , it does will not let 60HZ frequencies s can change. Then decrease the noise. By use the integrated circuit , 741 numbers highly popular , economize and don’t seek buy easy with , if , friends , want to [...]

      If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. We use this circuit The op-amp IC number CA3140 is the main equipment, acts as a voltage sensor that is accurate. So It is precision peak voltage detector circuit, and it remembers voltage value in a long memory time.       In this circuit is used with a positive signal input, when has negative feedback only. And the inverting input can only get some feedback, when diode D1-1N4148 is forward biased. When we put the input signal is positive, the output voltage of op-amp increases equal to the inverting input signal.       In working, the capacitor C1 is charged to maximum voltage. When the input is negative, the diode D1 will be reverse bias, the still voltage on the capacitor C1 [...]