Preamplifier circuit diagram with op-amp 12v

| | , ,

Preamplifier circuit diagram with op-amp 12v. Audio preamplifier circuit with op amp, can use various dual operational amplifiers such as TL072, NE5532, OPA2134, CA1458, RC4588, LM358, LM4558, NJM4560, LM258. Circuit using few components and easy assembly, includes single and double-sided board.

About the Audio Preamplifier Circuit with Operational Amplifier

The scheme uses an operational amplifier circuit in inverter configuration, using a simple power supply with a 12V to 24 VAC transformer and LM7812 voltage regulator.

It is configured for gain of about 6X, gain that can be adjusted by changing 2 resistors, R2 and R9.

R2=R9:
10K = Gain 4
5.6K = Gain 2.5
22K = Gain 10

Get new posts by email:
Follow us on social media

To do the calculation, use the calculator or the various tools available for mobile and computer.

The assembly is simple, using few components. The capacitors in the audio part should be of good quality, give preference to use operational amplifier sure to be original.

It has two options of printed circuit board, being a double-sided one that can be ordered from PCB manufacturers, it also has a single-sided version that can be used in the assembly of a homemade preamplifier.

The PCB is 50 mm x 32 mm, when ordering boards you can use the 2 × 3 panel order, so ordering 5 boards will get you 30 boards in the panel.

The purpose of the preamplifier is to raise the level of the audio signal to be delivered to the power amplifier, i.e., the power amp requires a 500mV signal at the input and the signal source is only 100mV. The pre-amplifier will boost this signal to get the most out of its power.

Some operational amplifiers that can be used are TL072, NE5532, OPA2134, CA1458, RC4588, LM358, LM4558, NJM4560, LM258 and others.

The power supply can be a simple source or a transformer, ideal for applications where it is not possible to use a symmetrical supply.

Audio preamplifier circuit diagram with TL072 or equivalent

Preamplifier Circuit Diagram With Op-Amp Schematic Ne5532
Preamplifier Circuit Diagram With Op-Amp Schematic Ne5532

Suggested PCB for mounting the audio preamplifier with ne5532 or equivalent.

Preamplifier Circuit Diagram With Op-Amp Pcb Bottom
Preamplifier Circuit Diagram With Op-Amp Pcb Bottom
Preamplifier Circuit Diagram With Op-Amp Pcb Silk
Preamplifier Circuit Diagram With Op-Amp Pcb Silk
Preamplifier Circuit Diagram With Op-Amp Tl072 Pcb Component View
Preamplifier Circuit Diagram With Op-Amp Tl072 Pcb Component View

BOM to assemble an audio preamplifier circuit with operational amplifier.

Last update: 02/22/2022 19:10

PartValueDescriptionQuantity
B1DB102 or equivalentBridge rectifier1
Capacitors
C1, C2100nFCeramic Capacitor2
C3, C5, C6, C74.7µF/16VElectrolytic capacitor4
C42200µG/25VElectrolytic capacitor1
C8470µ/16VElectrolytic capacitor1
C9100µF/16VElectrolytic capacitor1
C10, C11100pCeramic Capacitor2
Semiconductors
IC1NE5532N or equivalentDouble operational amplifier1
IC2LM781212V positive voltage regulator1
Resistors 1/4W
R1, R82.2KRed, Red, Red, Gold.2
R2, R915KBrown, Green, Orange, Gold.2
R3, R410KBrown, Black, Orange, Gold.2
Miscellaneous
CN1Power2-Way Connector Terminal Block 3.5 mm.1
CN2INJst Xh 2-Way Connector, 2.54 mm pitch or equivalent.1
CN3OUTJst Xh 2-Way Connector, 2.54 mm pitch or equivalent.1
Solder, Wires, Printed Circuit Board, Housing, 12V transformer

Download files for this assembly, includes PNG, PDF, PS and Gerber plates

Download

Mirror

How useful was this post?

Click on a star to rate it!

Average rating / 5. Vote count:

No votes so far! Be the first to rate this post.

As you found this post useful...

Share on the social networks!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Previous

Circuit diagram tpa3116d2 amplifier board xl6019

Download Edcalc Electrical and electronic circuits calculator

Next

2 thoughts on “Preamplifier circuit diagram with op-amp 12v”

  1. Please, can you tell to me where i place the c10 and c11 (100pf)? From your new diagram they not appere any more?
    Thx

    Reply

Leave a Comment