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DIY Mini-Guitar Amp, only $17, need some design tips

Catwell
I have tried to buy the little guitar amplifier off of various gadget websites, with no luck.
 
Normally I am against building something others already do better, and cheaper. But, in this case, I will have to build my own.
 
I need a little help. I have a reference design, about as simple as you can get. However, I want to add volume control. What do you recommend as a simple way to adjust power at the speaker? (Potentiometer on the speaker?)
 
image
IC1 = TDA7052 NXP Audio Ampifier
C1 = 10uF 25V Electrolytic Capacitor
C2 = 100nF 63V Ceramic Capacitor
C3 = 220µF 25V Electrolytic Capacitor
R1 = 22K 1/4W Resistor
J1 = Standard 1/4" guitar jack
J2 = Pending a good 3.5mm source...
Speaker = 1.5W Loudspeaker
B1 = 9V battery, Lithium rechargable
IC1 = TDA7052 NXP Audio AmpifierTDA7052 NXP Audio Ampifier  ~ $1.4
C1 = 10uF 25V Electrolytic Capacitor10uF 25V Electrolytic Capacitor ~ $0.08
C2 = 0.1uF 63V Ceramic Capacitor0.1uF 63V Ceramic Capacitor  ~ $0.37
C3 = 220µF 25V Electrolytic Capacitor220µF 25V Electrolytic Capacitor ~ $0.16
R1 = 22K 1/4W Resistor22K 1/4W Resistor ~ $0.06
J1 = Standard 1/4" guitar jackStandard 1/4" guitar jack ~ $3.79
J2 = Pending a good 3.5mm source... Assumed $3.79
Speaker = 1.5W Loudspeaker1.5W Loudspeaker ~ $4.09
B1 = 9V battery, Lithium rechargable ~$4.00
For a total of $17.74
 
 
This only used the audio amp IC for setting power, but I was thinking of adding some further amplifying stages after the IC. Thoughts on the best approach?
 
Cabe
 
 
 

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    What do you recommend as a simple way to adjust power at the speaker?

    Typically the pot would go on the input.  One side to GND, one to the input signal, wiper to the amplifier chip.

    For example http://audio-circuits.blogspot.com/2011/03/1w-mini-amplifier-circuit-based-tda7052.html

    I was thinking of adding some further amplifying stages after the IC.

    An "audio amplifier" is essentially an output stage.  If you need additional amplification due to low input signals, you'd add a pre-amp at the input using a different "style" of chip.  If you need additional power overall, you pick a different audio amplifier (which will usually require more battery power, since "theoretical maximum output power" is directly related to input voltage.  There are a lot of "audio amplifier" chips out there; is there  a reason you're focused on the TDA7052?  Nowadays I'd be thinking about the "class d" chips like the National Semi (TI!) http://www.national.com/mpf/LM/LM4667.html#Overview  (may not be very hobbyist-friendly, packaging-wise.)

     

    I have tried to buy the little guitar amplifier off of various gadget websites, with no luck.

    The little boxes widely sold as iPod speaker/amps have been looking like widely applicable general purpose battery powered audio amps to me, recently.  Price and "quality" go from low and adequate to pricey and "audiophile", in a wide variety of styles.  For example http://www.amazon.com/PA-219-Foldable-Speaker-Battery-included/dp/B000CSVMJ8  I don't know whether they're compatible with guitar outputs.

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  • 0
    What do you recommend as a simple way to adjust power at the speaker?

    Typically the pot would go on the input.  One side to GND, one to the input signal, wiper to the amplifier chip.

    For example http://audio-circuits.blogspot.com/2011/03/1w-mini-amplifier-circuit-based-tda7052.html

    I was thinking of adding some further amplifying stages after the IC.

    An "audio amplifier" is essentially an output stage.  If you need additional amplification due to low input signals, you'd add a pre-amp at the input using a different "style" of chip.  If you need additional power overall, you pick a different audio amplifier (which will usually require more battery power, since "theoretical maximum output power" is directly related to input voltage.  There are a lot of "audio amplifier" chips out there; is there  a reason you're focused on the TDA7052?  Nowadays I'd be thinking about the "class d" chips like the National Semi (TI!) http://www.national.com/mpf/LM/LM4667.html#Overview  (may not be very hobbyist-friendly, packaging-wise.)

     

    I have tried to buy the little guitar amplifier off of various gadget websites, with no luck.

    The little boxes widely sold as iPod speaker/amps have been looking like widely applicable general purpose battery powered audio amps to me, recently.  Price and "quality" go from low and adequate to pricey and "audiophile", in a wide variety of styles.  For example http://www.amazon.com/PA-219-Foldable-Speaker-Battery-included/dp/B000CSVMJ8  I don't know whether they're compatible with guitar outputs.

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