Bump it up a notch

Рет қаралды 10,912

4 жыл бұрын

Bump it up a notch
We take the summing amplifier and turn it into an audio mixer.
PCBWay Big Xmas Sale Nov. & Dec. Shopping Festival!: www.pcbway.com
Yes!! I now have merch: teespring.com/stores/learnele... Electronics themed T-Shirts!
HEY YOU ABOUT TO POST SOMETHING STUPID:
Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: cle.clinic/2TdS2Ux
One of the symptoms is that is causes fluid retention, mostly in the hands, feet/ankles, and face.
It will kill me one day. I'm doing ok right now, but someday...
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If you are shopping for electronic components, test gear or consumables please consider visiting my Amazon shop @ amazon.com/shop/learnelectronics
Please check out www.patreon.com/learnelectronics and pledge a dollar if you can. It will go a long way to keeping the channel alive. It costs a bit of money to buy all the items and produce these videos. You help is appreciated.
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Here is all the gear I currently use:
Oscilloscope 1: Rigol 1054Z amzn.to/2PRybtN
Oscilloscope 2: Siglent SDS1202X-E amzn.to/31Kk1yH
Power Supply 1: TekPower TP3005N amzn.to/2TeQnxI
Power Supply 2: RUIDENG DP50V5A amzn.to/2sNicSe
Signal Generator: JS2800 ban.ggood.vip/d9vk
DMM1: Owon18B amzn.to/2SbIGLs
DMM2: Aneng 8008 amzn.to/2sNQncI
DMM3: Aneng 8009 amzn.to/2S5qeEp
DMM4: Uni-T UT801 amzn.to/2S89SuL
Soldering Station1: Zeny (Yihua)862D+ amzn.to/2S49z4e
Soldering Station2: KSGR T12 amzn.to/2Wk7Dn9
Light Meter Smart Sensor AS803 amzn.to/2B2gyRg

Пікірлер: 55

@learnelectronics 4 жыл бұрын

Termination must have negative feedback. I switched them around when the current went from .579 to .529ma.

@beanmeup9902 4 жыл бұрын

Over time, your channel has become obviously and by a wide margin the best in class on KZfaq and the net. Were else can us humans find such great expertise, experience and knowledge!

@thinkright5611 4 жыл бұрын

@@beanmeup9902 I just ordered an RPi4 and stumbled upon your videos. I'm commenting here to say thank you for sharing.

@roccorid 4 жыл бұрын

Didnt know about termination, thanks!!!

@SkullDraizer 4 жыл бұрын

Glad this comment is here. I was starting to think I must be crazy.

@doctorbo5810 4 жыл бұрын

Your contributions have become an integral part of my hobby. I am 54 years old and started with the hobby electronics almost two years ago. I have already learned a lot from you. Thanks! Happy New Year!

@learnelectronics 4 жыл бұрын

Glad to help. Happy new year

@martinparnell8990 Жыл бұрын

Love your delivery. Great channel. No BS. I'm on year 2 of learning electronics, and im biten by the bug!

@worstuserever 4 жыл бұрын

Happy New Year to you and yours, Paul. Thank you for sharing your experience and knowledge, one of my key resources as I attempt to turn a patchy lifelong fascination into coherent and productive skill. Hope to see you reach that well-deserved 100K in 2020.

@XPFTP 4 жыл бұрын

happy new year to all.. i hope in 2020 we all see clearer...

@mikeoliver3254 4 жыл бұрын

XPFTP ugh that is such a bad pun. I love it.

@MCsCreations 4 жыл бұрын

Happy new year, dude! All the best wishes! 😊 Pretty nice project!

@willyrivero470 4 жыл бұрын

Nice added tip of the unused floating amp. That I didn't know though I wondered about it because I saw it in some diagrams. Thanks!

@somedude4122 4 жыл бұрын

I've been looking for this. Thanks man, you're a great help.

@michaelpadovani9566 4 жыл бұрын

Happy New Year Paul, just got back home from visiting family and friends. Nice to see the mixer circuit work well and i learned some things bout opamp terminations.

@zac1893 4 жыл бұрын

Another banger. Keep em comin

@frankowalker4662 4 жыл бұрын

I'm going to build a 6 channel stereo mixer using this, Thank you for the know-how. Happy new year everyone :)

@adailyllama4786 4 жыл бұрын

Happy New Year Paul

@MrBrymstond 4 жыл бұрын

Happy New Year and don't forget Hindsight is always 2020 looking back it's still a bit fuzzy.

@willyrivero470 4 жыл бұрын

Cool man. It's simple and fun. Never did it but will do it soon.

@YouAllKnowBob 4 жыл бұрын

Have a Happy New Year Paul!🎉🎊

@roccorid 4 жыл бұрын

Make vid on digital pots? Thanks for your kind work.

@KissAnalog 4 жыл бұрын

Happy New year Paul!

@learnelectronics 4 жыл бұрын

Thanks Eddie!

@K9-33 4 жыл бұрын

I think it should be non-inverting input (+) to ground and inverting input (-) to output.

@learnelectronics 4 жыл бұрын

Correct I switched them

@michaelhyde9971 4 жыл бұрын

Happy new year.

@simonyoungglostog 2 жыл бұрын

Excellent. The output looked inverted.

@GORF_EMPIRE 4 жыл бұрын

Happy New Year and great lesson. I would have kept the 10 k resistors in front of the pots.

@erikvincent5846 4 жыл бұрын

Now to bump it up from there and go over gyrators and op-amps and create EQ boost/cutters

@MalagasOnFire 4 жыл бұрын

Happy new year to all. thanks for the demo and advice. Also , In the datasheets of opamps, logic gates, etc there are some remarks about unused pins eg. LM358 , SN7404 ( search for "unused" :D)

@ottoomen5076 4 жыл бұрын

thanks so much! My new years resolution is to build, measure and describe 20 circuits. I will attempt mixing tomorrow!

@mikeoliver3254 4 жыл бұрын

How have I not though to play with wave types using an opamp while being hooked up to a scope. I’ve done it as a tone generator but never hooked up the output to see the cool wave patterns you can make. This video rocks Paul, I know what I’m doing today that’s for sure.

@learnelectronics 4 жыл бұрын

Happy new year, Mike!

@tenlittleindians 4 жыл бұрын

What about different impedance sources with this such as an electric guitar and a headphone jack out of a cell phone? Also, is there a simple way to time shift one of these signals so you can play with phase cancelation? A speaker hooked to your circuit might have made it a little clearer to understand the combined wave.

@GadgetReboot 4 жыл бұрын

Probably best to use a separate op amp buffer between various audio sources and the mixer inputs to keep impedances from interacting and loading the inputs that are susceptible. Phase shifting 180° for a complete cancellation I figure could be done with an inverting op amp unity gain configuration to mix with the original signal, but maybe RC filter networks can be used to shift the phase at specific frequencies but I don’t know how controllable that is. Something to play with maybe.

@ShungerYunger 4 жыл бұрын

Just a quick question, to terminate the op-amp with a unity gain setup, shouldn't you be wiring the terminals the other way around (inverting input to the output and non-inverting to ground) to have a negative feedback circuit? that way the output will always be at ground level. Or did I misunderstand (I'm still an engineering student so I might not now yet, but always looking to learn :D )

@learnelectronics 4 жыл бұрын

Yes, it was backwards, that's why I switched it.

@josephcote6120 4 жыл бұрын

Nice projects, good info. It would be nice to see a simple schematic of the circuit you're working with. It could help people who might want to re-create your projects to have that guide. Thanks.

@learnelectronics 4 жыл бұрын

The schematic is in the previous video: kzfaq.info/get/bejne/iNCilLhh0dPXe6s.html The only change are pots instead of resistors.

@cfusername 4 жыл бұрын

Happy new year Paul! Just wanted to ask if you maybe plan to test the ANENG AN888S benchtop multimeter in the near future? I find this thing pretty interesting, since it's affordable for a bench device and I wanted something like this for a long time.

@learnelectronics 4 жыл бұрын

I'm waiting on one to arrive.

@cfusername 4 жыл бұрын

@@learnelectronics That is great news! I guess, I'll wait then before getting one. It looks promising.

@daviddickey9832 4 жыл бұрын

This TL-072 op amp has a certain frequency range it can operate in? This is determined by the slew rate, correct? Is there anything we can do with external components to increase the apparent slew rate?

@drtidrow 4 жыл бұрын

A better figure to look at is the unity gain frequency and the gain vs. frequency chart in the datasheet. A good rule of thumb to follow is to make sure that the open-loop gain is at least ten times that of your closed-loop (ie, with feedback) gain at your desired maximum frequency. You also have to pay attention to the phase shift vs. frequency curve, otherwise you could wind up with an oscillator if you have some phase-shifting components in your feedback network.

@terrywilliams3741 3 жыл бұрын

Why my brain start freestyling to the beat at the end?

@davidluther3408 4 жыл бұрын

NOW THE NEXT TIME I GO TO ROCK CONCERT I CAN WATCH THE MIXERS DO THE MIXING AND,THINK OF YOUR DEMONSTRATION.KEEP A ROLLING KEEP A ROLLING DOWN THE LINE[BOB SEGAR].

@nigeljohnson9820 4 жыл бұрын

I do not think it is good practice to connect an amplifier output back to its positive input. There be oscillation and limit cycles. I think the correct termination arrangement for an under used op-amp should be: output connected to the inverting input, and non-inverting input connected to ground. When the inverting input is connected to the output, the op-amp becomes a non-inverting, unity gain, high impedance buffer, similar to the emitter follower. Then connecting the non inverting input to ground biases the output to ground potential. This arrange is some times used in single rail operation to provide a low impedance regulated half rail. Where a potential divider of equal value resistors are used to define the half rail voltage. And the the follower is used to convert this to a low impedance. The advantage is that the bias resistors can be of high value, drawing less current from the supply, while still generating a low impedance half rail that can be used as a ground reference for the remaining op-amps in the package. There limitation to this topology, but it works provided not too much current is taken or feed to this reference.

@learnelectronics 4 жыл бұрын

Please read pinned comment.

@nigeljohnson9820 4 жыл бұрын

@@learnelectronics I was going by the commentary in the video. I have added an explanation of why the correct arrangement works and some further application of the circuit topology. I was not attempting to score points.

@BrucesWorldofStuff 4 жыл бұрын

Happy New Year Paul.!!! Thanks for the videos... :D Everyone have a Bless and Safe 2020! LLAP

@flemming2jacobsen911 4 жыл бұрын

TI has a TechNote about termination. It basically says the same as Paul. www.ti.com/lit/an/sboa204a/sboa204a.pdf

@bud03038 4 жыл бұрын

Happy New Year! de WQ1I 73's

@deviserenity1873 4 жыл бұрын

First

@BURN_SHITTUBE 8 ай бұрын

3:05 Just wondering if both frequencies are direct multiples of each other (5KHz sine wave and 10KHz square wave) then why is the square wave acting all weird on the scope?