It is useful to use dedicated ICs not exactly as intended. That why one should look the datasheet to see what is inside. I made oscillators with the old TDA2003, I used it as comparator; it is a opamp with high power output after all. When I got some TBA440 (video IF amp&demodulator) I made two walkie-talkie from them, one IC for emitter and one for receiver on each walkie-talkie. Also the TBA120 made a nice modulator as alternate use.
Oh that is gorgeous. I love subverting common ic's. That "split a voltage a voltage in half with pos and neg rails" circuit addresses a problem I find far too often.
If i'm not mistaken, is this IC also used in the very low-end speaker sets of Logitech, like the S100 and S120. My first signal tracer was build with the circuit of such speakerset. A small value +600V rated capacitor to block DC and you are good to go.
Hello. Just one point, when used as an amplifier, or as phase shift oscillator, Its good to use the Zobel network on the output (pin 8) as you have done, but the resistor should be 2.7ohms NOT 2K7 !! Cheers B.
Bill thanks for sharing. Your presentation of the circuit diagrams are very informative and helpful. Probably the clearest I’ve seen. Hope all is good. Artie 😊
"virtual ground" is exaclty what sprung to my mind immediately after seeing the title of the video and going to read the datasheet. It's unfortunate though that the chip is specced only for >= 10V. It would be really useful if it could work at 9V for providing virtual grounds to battery-powered devices. Though, even with the current limiting resistors, the quiescent current of tens of mA would deplete a 9V cell quickly, so more of an academic interest really. There are better arrangements for virtual grounds at 9V to be sure, but it's an interesting application nonetheless.
I think the fault in the original power splitter circuit was that the neg input should have been connected to the output, not ground, to create a unity gain amp.
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the way you depicted your test results really helped me think of my testing procedure. keep rocking. thank you!
It is useful to use dedicated ICs not exactly as intended. That why one should look the datasheet to see what is inside. I made oscillators with the old TDA2003, I used it as comparator; it is a opamp with high power output after all. When I got some TBA440 (video IF amp&demodulator) I made two walkie-talkie from them, one IC for emitter and one for receiver on each walkie-talkie. Also the TBA120 made a nice modulator as alternate use.
Nice! Thanks Bill!
Excellent info and demo's.....thank you so much!
Oh that is gorgeous. I love subverting common ic's. That "split a voltage a voltage in half with pos and neg rails" circuit addresses a problem I find far too often.
Very interesting use of this IC. Good video as always, thank you. 👍
Good content. Good diagrams.
If i'm not mistaken, is this IC also used in the very low-end speaker sets of Logitech, like the S100 and S120. My first signal tracer was build with the circuit of such speakerset.
A small value +600V rated capacitor to block DC and you are good to go.
Hello. Just one point, when used as an amplifier, or as phase shift oscillator, Its good to use the Zobel network on the output (pin 8) as you have done, but the resistor should be 2.7ohms NOT 2K7 !! Cheers B.
Bill thanks for sharing. Your presentation of the circuit diagrams are very informative and helpful. Probably the clearest I’ve seen. Hope all is good. Artie 😊
"virtual ground" is exaclty what sprung to my mind immediately after seeing the title of the video and going to read the datasheet. It's unfortunate though that the chip is specced only for >= 10V. It would be really useful if it could work at 9V for providing virtual grounds to battery-powered devices. Though, even with the current limiting resistors, the quiescent current of tens of mA would deplete a 9V cell quickly, so more of an academic interest really. There are better arrangements for virtual grounds at 9V to be sure, but it's an interesting application nonetheless.
There's always the ICL7660A that covers +/-1.5v to +/-12v if you need it.
Good Video one question with the virtual ground let say have 18V input and +9/-9V output how many milli amp's are supported on the negative output ?
Isn't the virtual ground no more than a simple voltage divider that you can make with just two resistors?
Fun to make the venerable 50 y.o. LM380 do new tricks!
I think the fault in the original power splitter circuit was that the neg input should have been connected to the output, not ground, to create a unity gain amp.
Without the speaker the loop gain is too high and the waveform is distorted.
Pin2 is not connected to ground. Shematic is false!!!