Thank God you made this video I actually ordered the amplifier based off your recommendation. When it came in I was very confused on how to hook it up. I feel like I'm going down a very deep rabbit hole that has no bottom.

I've been stymied, not being able to test some new amp boards, as I only have a single rail dc power supply. This will solve the problem perfectly. Thanks John!

Nice one John! That's just what the doctor ordered. I wired up a 386 board with a mic and a speaker(I think I need that board in the video) Installed the mic on the corner of my house and it thwarted two attempts at burglary in two days. The 386 is touchy on the adjustment though but when its tuned its great. Can listen to the birds chirping in the kitchen and my cat loves listening to them too.

The first sound sample was the best you ever had, John. Great video as allways, thank you!

just wanted to say thank you for teaching us how to hook this up. i ordered this kit due to your recommendation from another video you made and was wondering how i was gonna power the thing after soldering it all together, which led me to this video. success. appreciate it very much. thanks. take care.

TDA 2006 is a dual supply amplifier (simular to the TDA 2030/2050) that I stole from an old CRT TV, and there it was used as a single supply amp? Speaker connected directly to -Vs.

Thanks I had been wondering how to run this amp board I had got a while back Never thought I would use it

Best way to find high power transformers for amplifiers - in broken amplifiers! Who would believe that ;-) Or other things that do amplifier stuff too, like some dvd players with hi-power speaker+woofer output, home cinemas/old big CRT TVs (sometimes)... From the dumpsters, or on ebay/local online or real flea market - for less than their worth in copper, usually.

I had a speaker DAC without power board and repaired like so; 4 zener diodes 12v*2 on negative and 12v*2 on positive, center between 4 diodes is the virtual ground. Used 2 parallels of 1 amp 12v diodes to get 2 amps on each ray and a 24v psu. If you don't mind the offset, your solution is much more practical! Great video!

Thanks John this is what I was working for to play with my little power supply project.

I can use this scheme also for power up a dual rail analog switch? Like the MAX4678?

Sir, all your videos are wonderful & informative. I Love them all :-) :-)

OMG Thank You! Thank You!!! i can now power my 60w rms audio amplifier without buying special transformer!!! Thank You alot! This helps me alot!

so, if I have 48v power supply, and i want to drive the amplifier that need at least 5A, what is the best value for the resistor

bean fiddling with TDA's and Transistors building little amplifiers and you just blew my mind!!!....Of course we don't the DC split......how come I didn't think of that!!! so simple

Can I power a single supply amp with a dual supply?(+ input into live terminal and - input into neutral terminal)?

Hi John, I will have to build more than one single rail power supply for the amps I have ordered, please let me know where I can buy the correct resistors and capacitors 1k1w and 4.700 respectively. Thank you for your help.

How would that dual power supply look without the board, just using the components?

I have a small preamp with the power connection of +12V, 0, -12V A/C that I was able to run just fine without the virtual ground, from a 24V D/C power supply. There is a bridge rectifier close to the power connector so I figured it would work fine with D/C and it seemingly does without any trouble or extra heat or anything. It also seems to have a better noise floor as well with the D/C supply, so no noise when no signal is input.

Can i use that on the 12v car battery?

Will this work with tda7293 100w amp module from ebay

Thank you for creating this!

A simple rail splitter like this will almost always have an unbalanced ground. Due to biasing and the op amp, slightly more current will probably be pulled from one of the rails. It usually doesn't matter, but if it does matter, could you buffer the ground to lock it in tighter?

Excellent video. Really informative!

I have a 62V DC 5A adapter ... After split what do you think i will get out of it ? And what audio kit will get most of it ?

Is there any difference in output power when the amplifier is powered by Single supply and Split supply ? I mean to say that does an amplifier gives more power if operated on Split supply than Single supply ?

What can I do when my amplifier already have a bridge rectifier built in to it? I have a 1x100w TDA7293

Do you think this would work on a synth that needs -v, I had used a buck converter but it was too much noise. The schimatic says it need 12+-v 500ma.

Can I use this for TDA 2030 based amps?

wouldn't the 1k resistors be dependent on the current draw?

1k 1w resistor. Does it matter from the voltage. How big and what kind of resistor to use. Also the amperage.

I love the lab cat 😂😂

It is showing the correct readings in the multimeter. When i give the load it is shifting back to the original voltage. And the ground is nil. Any idea why is it hapening ?

Really man, you saved my life. But, could I use those on three(or four) TDA7293s on parallel mode? Use 10,000uf caps? 5w resistors?

Can I use dual smps to get a negative output please reply 🙏🙏

How about high power class d amplifier with 48v...will this still work?

Can you Bridge these Boards ?

Sir can I do that on ac single 12 volts ac turn into 2 12volts ac?

Good day sir is there a way to power ac gnd ac using batteries or 12v power supply? Thank you

It's work's for TDA2030 AMPLIFIER CIRCUIT ?

Can I add two 1k resistors on input because of the noise(one on left channel(adding resistor to white wire) and the other on right(adding resistor to a red wire) ?

what if i put two amps on the same circuit??

Hi John. Can you please point me to which video you discuss the detail of the bipolar dual rail circuit in the top drawing at the start of the video?

is it fine that the center ground isn't 0volt?

Can we connect two 12 Volt 2 Ampere smps supply in series to make dual supply for powering this type of boards ? Will there be any problem ?

Very helpful! What would happen to the chip, if one side of the supply gets faulty or gets unbalanced a lot.

LOL, I have that same RS calculator. The right side pad only works sometimes if you fold it in slightly.

Does VG connect between the two 1K resistors? I cannot make out if there is a dot where the wires cross.

can we get the circuit from the module

What are the DPST switches used for? I am going to do this with batteries. I need switches ?

Would be viable to use the 12v+ of 2 molex from a pc atx powersupply to feed dual +-12v ac to a circuit? Is there a way? Like uniting both + and gnd from the molex with each other + and gnd respectively and making the virtual ground connection normally like the video?. Or making 2 separate circuits (1 for each molex) and then pairing the + - and virtual gnd of each one in the amp circuit terminal?

Hi sir. What if i use 70v dc. Can rmthe circuit handle it?

Howdy. I wonder if replacing the resistors with 9V zenerdiodes would work ? Yes. The virtual Neutral would sway somewhat but that happenes with the resistors too. However, there would be no resistor leakage. Regards.

Can i use 24volts in that??

Hi, I am looking to power a mono amp with a 36v bicycle battery. So I guess this solution would work for a single battery as well? Do you recommend any single chanel amp that can take 36v supply?

Hi, i have plans of building an amp out of from two or three bridged lm3886 for each chanel. They need +-28v for full output. I have a Meanwell 48v 600w single rail power supply. Would this work for this application and what values for the caps and restistors should i aim for? The power supply can be adjusted to 55v, which is is near enough the double of 28v.

Hi John, it might be oversized, but what about using cheap audio amps like the TDA2030 as railsplitter?

Hello, how many amps does the maximum current pass through this circuit?

Hi jonh i am a fan of your video. Specially those of amps. On a microlab subwoofer i found a non center tapped transformer 2 diodes and 2 caps. There were 2 cable at secondary side. 1 cable was directly connected to one cap's positive and one cap's negetive and one cable was connected through two diodes to other negetive and positive of those cap's. If you understand what I mean. Sorry i am not on my pc so cannot give you the diagram right now. Now my question is this kind of symmetrical power supply is any good for the amp? I mean how the amp perform using this kind of supply? Thanks a lot. Keep up the good work.

Hi John. Very helpful video, thank you. A question if you don't mind : I have two 10000µF (63 volts) capacitors salvaged from an old receiver. Can I use those instead of the two 4700µF you suggest ?

I use computer PSUs for all my speaker projects, as it provides clean 12v's and loads of amps. Can I safely use this splitter board at higher wattages? I grabbed a cheap _IRS2092S 500W Mono Channel Digital Amplifier Class D_ and a 600w DC upconverter to feed it the 65v it needs. Now I have no way of powering it and I really don't want to spend 3x as much on a dual DC power supply... :^/

I am a bit confused. I thought you were showing how to use 1 power supply to power two boards. In a normal setup, could someone just use two 12-0-12 transformers (one each) and make it like a big boy amp? I am new to this so trying to understand. I see the value of a single wall wart connect, but cant see how you connect to two to get stereo ...help :-)

How well does this work as far as noise and ripple are concerned , im asking as bought a similar kit recently thou was goimg to power it from an 15v ac to ac adapter .

John, excellent video, thank you! However, am I right in thinking that, because of the limited capacity of the caps, low frequencies would distort sooner than high frequencies? It seems to me that low frequencies would move the virtual ground voltage up and down more than higher frequencies.

Hi and thank you for this extremely helpful tutorial From what i understand the best mains transformer for a dual power supply is a center tapped one ? i have seen in the web some schematics to get a dual power supply from a single secondary winding What kind of issues i will have from not using a center tapped one ? i like the single transformers best I do not know why

I have a board that requires three rail ac supply. I have a 28vac transformer. is there a way to make it a 14-0-14 ac ?

Hi John. I have a 120 volts and want the output to be 60 volts each. Can you tell me the value of capacitor and wattage of resistor to be used..Thanks

Skynet adapter? Is it possible they take it from the terminator movie's 😂😂😂

Can this arrangement give the maximum output of tda2030 as in split supply?

What if you use single supply positive connected to both supply ? Example :- we have smps +24 -0 I wanted to understand why cant we use +24 0 +24 ? Will it work ?

I probably bought these parts 2 years ago and never made the circuit. Now it all makes perfect sense. I might try to use the dual volt source idea to make a simple guitar amp in a box. Edit: just realized I would be trying to use the 9 Volt pedal supply as 2 sources. That seems like a terrible idea. Maybe I'll get an 18 volt pedal supply

Great work what I need thanx.

Your videos are one of the best in YT-audio business. I can listen them and enjoy your clear output and movie star voice while jogging. But my question is what was that speaker? It has good sound even through camera mic(or was it lapel..) I take you have made it yourself. How is the crossover? What are the elements? Possibly you have video on that too...

I’m interested in updating a vintage single rail integrated amp with the LM1875 boards. I recapped this amp before considering this. It has a 45 volt B+. While recapping it I upped the the B+ cap from 2000uf to 3800uf and was wondering if the dual supply caps need to be as large as 4700uf or if there is anything else I should consider? This is the late version of the Realistic SA-700 that had an intermittent channel. I have since found the problem but am still interested in this mod. Thank you for all your very educational videos.

watts about plz?

i found an old audio amplifier that i took apart and rescued 3 tda2030av chips. i want to make a 2.1 amp out of it but i only found schematics with dual power supply. can i use 2 3300uf capacitors? hope this works and i will be able to power it with a 12v dc adapter. :D

Hello sir. My amplifier board needs 12 v dual power supply. How it works using 12 v battery

when you say it is an ac circuit, Do you mean if I was to get one of these boards I could power it strait from wall outlet ?

Have one question John. What if the Transformer amp is twice as much as needed? But the voltage fits Any solution to that, if so what is it? Like let say you need a dual 12 volts 30 va transformer. But the transformer is dual 12v 60 va. You proberly need a Resistance and a fuse. I just do not get that how Ohm law apply to this, Since the voltage and amp are already given.

Thankyou

hey, may i borrow your expertise on an amplifier project that I've been struggling with, somewhat related to this video? the premise is that I have a pair of amp chips, which usually run on 24VAC, but instead, im running them with 2x 24V meanwell DC power supplies, which i am running in series, with a center tap between the two power sources to be my virtual ground. The amp chips work fine, but I've cooked something when trying to connect a low pass filter chip, and/or the aux socket to the amp chip's input terminals. I'm pretty sure that because my virtual ground is at +24v, and the sleeve is true/chassis ground, there is a shorted potential. So, I've added DC blocking capacitors between the socket, and the virtual ground, and another one between the two signal ground terminals, and still, something is cooking. The low pass filter runs off the first power supply for +24 DC power, if that helps. Thank you for reading.

Hi john , i have a 48v 2A single power supply, do you think it would be safer to upgrade the two 1k 1W to 1k 5w resistor. as it would disipate heat quicker and stay cooler, am i right?

Can this be done with larger amplifiers with larger power needs? I have two 150w amp modules that require dual rail supply.. and i have 48v 350w switch mode power supply so im wondering if something like this can be done on larger amps and power supplies?

Hi John, early on in the video you said you would like to find a source for the boards or even to buy the kit. Many long yars ago I bought four of them from kitsrus but i do not know if the company is still in business. You can buy these also from Qkits in Ontario, and perhaps also from othe vendors. Thank you for the video.

John, I have a split supply TDA-2050 stereo power amplifier board with build-in bridge rectifier and 4 x 3300 uF capactors (for both channels). Also I have kind of suitable power transformer with a single 30V (4A) winding without a center tap. I've got an idea to build for that amplifier a rail splitter using LM675 power opamp. That's a typical application for that device and it's shown in the 2013 Rev. of Datasheet for LM675 (Figure 3. Generating a Split Supply From a Single Supply). I have figured out this LM675 rail splitter can be easily assembled on the very same (LM1875) amplifier PCB that you have demonstrated in this video. Some parts would be omited, some - replaced with jumpers and some other - just relocated. And the 0.22 uF capacitor in the output Zobel circuit needs to be connected to a negative rail instead of a ground wire. I've got a question: Could that circuit be connected to a positive rail instead of the negative one? Such connection might be somewhat more convenient on this PCB. And what do you think about this whole idea?

I made a dual supply using two 1K 2Watts resistors and two 4700 capacitors and powered it with 24 Volts 2 Ampere supply but the power output was only 6 watts max before Clipping. I expected atleast 10 Watts

2:11 How about a totem pole transistor configuration with pull up/down resistors to split the power rail? ... rather than these resistors. Simulation shows it works fine and current has a return path.

You can get a TDA2030A kit, similar to what is seen on this video, for the modest sum of $1.22, shipping included. Rather amazing.

plz make a video on tda 7388

I love this video

Pm me can you install do sola battery......

Thanks sir ji

before I knew about this, I connected the sound to the v+ GND and v- and used dc power into the white connector. I got the speaker output right tho. LOL! So don't do that or else it goes on fire.

The cat has its years numbered 🌚

Hello Sir, I need your assistance. I am using some analogue sensors. Am using more than one (12) sensors on a vehicle. I want to aggregate all the voltages from the sensors and give it a single output. Please can you advice or recommend any electrical item that can help me do this please. Thank you

Immediately thumbs-upped the cat hell yeah

Not sure i understand the 1K. What if you need significant current? I guess the amp pulls its main current through each + / - leg and not through the 1k? But wont it still need to sink the current...i guess the cap gives it an AC sink though. Interesting circuit

I was thinking about building a boombox that could like output a total of 100w using TDA7294 it does sound dumb to use a Class b rather than a class d in a portable application but like I would rather go for sound quality over more playback time but like the only problem was the dual supply. So what I did was order a boost Converter off of bang good and boosted the 12v to 70 volts and split them using two capacitors but how long would these capacitor bank survive on a 130w of total power consumption?

PS-John I looked at the board I got from Kitsrus many long years ago and the trace is much smaller and will not handle the current load as well as the trace on the board you are displaying. Best to you in finding some good boards.

I want to say thank you, i used an LM1875 with an old HP printer power supply (32v, 1560mA) and used your modification to get dual power. It works great, i wonder if i can use it to power up 2x 1875 or if it is too much. My speakers are 6Ω (small ones 2way)