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?)
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
