Thanks for the educational video. I have made a 3005 lead 12 Marshall preamp. It works well with +17/-17 volts. I tried to make it work with a single power supply using biasing like you showed. It worked with Tl072 but heavily distorted. But didn't work with the original 1458 and JRC4558. What changes should I do to make it work.
Excellent development and technical approach. My congratulations....! One question, just to check. For the unity gain case of the Opamp, Rg-Cg is not necessary...and Rf = 0 ? This is the typical case for using a unipolar supply differential A/D converter. Very good video OldHack !!!! An honor to write the 1st comment.
I've built the circuit shown at the 5 minute mark to condition a signal from a piezo disc. I'm attempting to collect chest expansion (from breathing) and heart beats when the piezo is laid upon. I was wondering if you could comment on the 2 capacitors stimming from the V_s? How to size them and why are there two? Thanks in advance!
Thanks for the comment. It depends on how noisy your supply is. If the power comes from a rectified AC line and has some power line ripple in it, it's typical to have a large value capacitor like a 10-47µF electrolytic or tantalum type. Since most large capacitor values will have a significant Effective Series Resistance (ESR), it's necessary to put a smaller value ceramic or mylar type in parallel, having a low ESR to help shunt the higher frequency noise that may be on the supply line.
These lectures are gold! Keep them coming!!
Thank you! Will do!
excellent work again
Thank you so much 😀
Thanks for the educational video. I have made a 3005 lead 12 Marshall preamp. It works well with +17/-17 volts. I tried to make it work with a single power supply using biasing like you showed. It worked with Tl072 but heavily distorted. But didn't work with the original 1458 and JRC4558. What changes should I do to make it work.
I’d need to see your schematic.
Excellent development and technical approach. My congratulations....! One question, just to check. For the unity gain case of the Opamp, Rg-Cg is not necessary...and Rf = 0 ? This is the typical case for using a unipolar supply differential A/D converter. Very good video OldHack !!!! An honor to write the 1st comment.
Yes correct. Thanks so much for the comment!
I've built the circuit shown at the 5 minute mark to condition a signal from a piezo disc. I'm attempting to collect chest expansion (from breathing) and heart beats when the piezo is laid upon. I was wondering if you could comment on the 2 capacitors stimming from the V_s? How to size them and why are there two? Thanks in advance!
Thanks for the comment. It depends on how noisy your supply is. If the power comes from a rectified AC line and has some power line ripple in it, it's typical to have a large value capacitor like a 10-47µF electrolytic or tantalum type. Since most large capacitor values will have a significant Effective Series Resistance (ESR), it's necessary to put a smaller value ceramic or mylar type in parallel, having a low ESR to help shunt the higher frequency noise that may be on the supply line.
I'm going to use the Edison method - blow up several IC's before getting it right LOL
Lol. Sounds like something I would do.
Sir could you please add one application of this circuit how the opamp datasheet parameters used in the the design analysis 🙏
Audio amplifier. Guitar pedals typically use 9V batteries and use these techniques. Only ideal opamp abstraction was used here.