Комментарии:
I love this video
Ответитьis it fine that the center ground isn't 0volt?
ОтветитьI 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.
ОтветитьThank 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.
ОтветитьCan 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) ?
ОтветитьHi sir. What if i use 70v dc. Can rmthe circuit handle it?
ОтветитьJohn, 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?
The cat has its years numbered 🌚
ОтветитьGreat work what I need thanx.
ОтветитьSomeone likes his chewy bars.
ОтветитьHello 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
The first sound sample was the best you ever had, John. Great video as allways, thank you!
ОтветитьI 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
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?
ОтветитьCan 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 ?
Ответитьyes i got a preamp board like that was like why would one to this bs lol
ОтветитьThis circuit is very clever because the two 4,700u electrolytics actually stabilize the centre rail by an effect of nearly 10,000u because when one is charging the other one is discharging and BOTH of them work like (added together) shock-absorbers to reduce the movement of the centre rail. That's why the circuit works so effectively. We normally think of 1,000u controlling (stabilizing) (smoothing) a power supply of 1 amp to reduce the ripple to about 7v. So 10,000u will reduce the movement of the centre rail to 700mV and since the amplifier is not trying the pass very much current via the centre rail, the ripple (movement) will be very very small.
A reader below 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 at least 10 Watts.
You can reduce the 1k resistors to improve the stability of the centre rail. Try down to 100R at higher wattage.
A reader asks: I wanted to understand why cant we use +24 0 +24
+24 0 +24 is actually +24 0 -24 because you can reverse the diode on the second winding and it will only output a current when the output is negative.
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 :-)
ОтветитьTDA 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.
ОтветитьImmediately thumbs-upped the cat hell yeah
Ответитьi 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
ОтветитьWhat 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 ?
Can I use dual smps to get a negative output please reply 🙏🙏
ОтветитьCan i use 24volts in that??
Ответитьwhat if i put two amps on the same circuit??
ОтветитьDo 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.
ОтветитьExcellent video. Really informative!
Ответить👍👍👍
ОтветитьHow about high power class d amplifier with 48v...will this still work?
ОтветитьWhat can I do when my amplifier already have a bridge rectifier built in to it?
I have a 1x100w TDA7293
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.
Hi
ОтветитьSir
ОтветитьPower with cat modulation :P
Ответитьhey, 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.
ОтветитьSir can I do that on ac single 12 volts ac turn into 2 12volts ac?
ОтветитьCan I use this for TDA 2030 based amps?
ОтветитьThankyou
ОтветитьIt 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 ?
Ответитьwouldn't the 1k resistors be dependent on the current draw?
ОтветитьSir i have a class d amp which need dual voltages +-24 and i have single 24volt 8 amp supply is there any way to convert into dual???
ОтветитьI'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!
ОтветитьThanks I had been wondering how to run this amp board I had got a while back
Never thought I would use it
1k 1w resistor. Does it matter from the voltage. How big and what kind of resistor to use. Also the amperage.
ОтветитьGood day sir is there a way to power ac gnd ac using batteries or 12v power supply? Thank you
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