Logarithmic Amplifier Design with Op Amp, BJT transistor, Thin Film Resistors

[@STEMprof]

Thanks for watching. For more Op Amp Circuits please see: Analog Logarithm Computer: How does it work? kzbin.info/www/bejne/iKGudqRrjN6igsk Anti-Log Analog Computer with Temperature Compensation kzbin.info/www/bejne/oZyVlGp9oJihjZY Op Amp Amplifier with Electronic Gain Control kzbin.info/www/bejne/hKCxmISml89qbbs VCA: Voltage-Controlled Exponential Attenuator Explained kzbin.info/www/bejne/mXfdio2phaqnhpI Analog Power Raiser design with OpAmp & Transistor kzbin.info/www/bejne/h5aWlIxvf7itj8k which is an Analog Computer that raises signal to the Power signal. Push-Pull Power Amplifier with Darlington Transistors kzbin.info/www/bejne/bmeZfoyfl9Rrr6c Op Amp Analog Computer Differential Equation Solver kzbin.info/www/bejne/e3_UZGx7mtiZhtk Wilson Current Mirror and Current Source Design kzbin.info/www/bejne/gpfFl32Pp9SphJI Thermometer Circuit Design with Op Amp & BJT transistor kzbin.info/www/bejne/a2a8pKWXe6pjqMk Analog Logarithm Computer kzbin.info/www/bejne/iKGudqRrjN6igsk Programmable Current Source Design with Op Amp, Zener Diode and Digital Potentiometer kzbin.info/www/bejne/iGLbZ3Vmicitjc0 On-Chip BJT Current Source Design kzbin.info/www/bejne/iKSamHiDoJVmmtk Instrumentation Amplifier with Electronic Gain Control kzbin.info/www/bejne/eWXXmJuQYtZpkNU Sawtooth Oscillator Design kzbin.info/www/bejne/aJa4pHqGm9aVjZY Triangle Oscillator Op Amp circuit kzbin.info/www/bejne/gHeYhqOVmNp_b80 Sallen-Key Analog Filter Design Tutorial kzbin.info/www/bejne/gai4n4SOl9Bqna8 How to find Bode Plot, Freq Response, Transfer Function of Analog Filters kzbin.info/www/bejne/rIupnIObecZkfpo Universal Analog Filter Design kzbin.info/www/bejne/aHuQYaCpjb94aNE Laplace Transform Example and S-domain circuit analysis: kzbin.info/www/bejne/pqSbf2iKhbKSp7c Op Amp circuit Bode Frequency plot kzbin.info/www/bejne/eH25q6irpqafkNU Lowpass Butterworth Filter: kzbin.info/www/bejne/i6umm56tpt5gb9k Analog Computer to Raise Signal to power n kzbin.info/www/bejne/f4a3nXV-Zrqll6c Differential Equation Solver Analog Circuit kzbin.info/www/bejne/iGS7ZnSPg796e6s Complex Sinusoid Oscillator kzbin.info/www/bejne/fYm1maCtorhokM0 Full-Wave Rectifier circuit example kzbin.info/www/bejne/enutfoGLYqiMmck Sawtooth Waveform Generator design with OpAmp, JFET, BJT kzbin.info/www/bejne/a6uriYeuYrufaJI op amps Circuit with feedback loops to design an analog computer that solves a second order differential equation kzbin.info/www/bejne/fpa9g6ekh72je6s For more analog circuits and signal processing examples see: kzbin.info/aero/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit design and analysis videos are helpful. 🙂

[@AndyFletcherX31]

The resistors (R) could be supplied in a resistor pack containing 4 resistors. They will tend to be well matched and the typical 100ppm/C tracking will be very good resulting in minimum error

[@STEMprof]

Good point! Thanks for sharing your thoughts. For more Log and Exponential amplifiers examples pls see the Electronic Amplifiers Videos Playlist kzbin.info/aero/PLrwXF7N522y5679YAO-lFrNVYqV9XMNTr

[@anoimo9013]

what are the capacitors used for?

[@STEMprof]

Thanks for watching and your good question. The op amp feedback capacitors are in place for practical consideration to ensure the presence of negative feedback during transient response since the main feedback path for each op amp is just Diode-connected BJT transistor. I hope this explanation is helpful. For a related example please see Analog Computer Vector Sum Calculator Design with Op Amp, BJT Transistors kzbin.info/www/bejne/hnqkpJRmhrOJpNU. For more analog circuits and signal processing examples see: kzbin.info/aero/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit design videos are helpful. 🙂

[@Nahash5150]

Good stuff.

[@STEMprof]

Thanks for watching. Glad that you liked this Log Amplifier Circuit Design video. For more analog circuits and signal processing examples see: kzbin.info/aero/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit design and analysis videos are interesting as well. 🙂

[@Nahash5150]

@@STEMprof thank you I definitely will. It's difficult to find analog circuit design explanations.

[@STEMprof]

@@Nahash5150 You're welcome. I hope this channel is helpful.