# Does the TDA2030 need negative potential?

May 12, 2015
4,887

Moderator
Sep 5, 2009
14,232

#### Aniket Kumar Singh

May 8, 2019
3
For any kind of amplifier dual power supply is the first priority for any electronics engineer, however single supplies can also be employed. The basic difference is that if you apply dual supply topology then your signal gets amplified between +Vcc and -Vee. In case of single supply the amplification is between +Vcc/2 and -Vcc/2.

#### Audioguru

Sep 24, 2016
3,656
If you apply dual supply topology then your signal gets amplified between +Vcc and -Vee.
Correct.
In case of single supply the amplification is between +Vcc/2 and -Vcc/2.
I disagree. The amplification is between +Vcc and 0V.

Also, many car amplifiers are single supply and are bridged for almost 4 times the output power of a single amplifier. Since each speaker wire is driven and each is at half the supply voltage then an output coupling capacitor is not needed to block the DC.

#### Aniket Kumar Singh

May 8, 2019
3
Correct.

I disagree. The amplification is between +Vcc and 0V.

Also, many car amplifiers are single supply and are bridged for almost 4 times the output power of a single amplifier. Since each speaker wire is driven and each is at half the supply voltage then an output coupling capacitor is not needed to block the DC.
I agree , I meant to say that for example if you are using 12 volts the amplification will be between +6 volts

#### Audioguru

Sep 24, 2016
3,656
Take an LM386 little amplifier IC and power it from 12VDC and 0V. Its maximum output into an 8 ohm speaker is not 12V peak-to-peak, instead it has voltage losses that are shown on a graph in its datasheet as a typical maximum peak-to-peak of only about 6.5V, not 12V. Since the voltage swing is less then the current swing is also less so the actual output power is almost only 1/4 as much as you think.

#### Attachments

• LM386 output voltage swing.png
22.9 KB · Views: 3

#### WHONOES

May 20, 2017
1,217
If the Pk - Pk is only 6.5V then O/P power is only ((6.5 / 2) * 0.707) / R times the first part of the sum which equates to 1.32Watts into 8Ω at 12V supply.

#### davenn

Moderator
Sep 5, 2009
14,232
I agree , I meant to say that for example if you are using 12 volts the amplification will be between +6 volts

that's still incorrect as there is no -6V

#### Audioguru

Sep 24, 2016
3,656
With an LM386 amplifier driving an 8 ohm speaker and a 12V supply, the speaker peak-to-peak voltage swing is +3.25V to -3.25V.

#### aurelZ

Jun 10, 2019
98
Yeah maybe is obsolete but is for sure one of the best APA chips ever made.
This chip with +/- 18V gives the best results but if you don't have such a trafo then you can try
single power supply with 24V,check this...

#### Audioguru

Sep 24, 2016
3,656
The datasheet for the old TDA2030A has specifications with a +/-16V supply so that it does not overheat. Only 10W into 8 ohms is guaranteed but 12W is typical with 0.5% distortion. The datasheet shows two bridged TDA2030A ICs typically producing 34W into 8 ohms at probably 0.5% distortion with a +/-16V supply.

#### hevans1944

##### Hop - AC8NS
Jun 21, 2012
4,875
The problem with Class D amplifiers is, they come in surface mount package whereas I need a through hole package that I can solder with soldering iron. I don't have a blowing gun.
You can buy circuit-board adapters that accept surface mount ICs and fan their leads out to through-hole pads. It is fairly easy to "drag solder" the surface mount component onto the adapter using an ordinary soldering tip and perhaps a head-mounted magnifier. Google for YouTube videos on how to do this. I did it with a 6-pin PIC that came in an SMD package, but later I ordered the same PIC in a DIP configuration, which made bread-boarding sooo much easier.

Replies
3
Views
78
Replies
6
Views
261
Replies
6
Views
473
Replies
4
Views
221
Replies
10
Views
658