Hello fellow audiophiles and electronic junkies.
I had a lot of free time the past few days so I decided to have some fun and try to make a portable audio amplifier, with speakers running on a battery.
I had a lot of electronic components acummulated over the years, unfortunately I've lost them all when i moved to the new apartment. So i had to start over by scavenging old electronics.
This is what i found:
c4558c - high perf. dual opamp (found in a keyboard i got 15 years ago 😀)
jrc 4558d - dual opamp from some pc speaker system
tda2030a x2 - 18W Hi-Fi amp & 35W driver
lm358 x2 - opamp
3472c x4 - High-slew-rate, single-supply op amp
Few hundreds of different capacitors, resistors, inductors, some diodes and transistors.
Audio jacks, leds,lot of other surface mounted stuff that i didn't want to desolder and other unknown ICs.
The past 2 days I was researching a lot about it, and found a lot of guides to build one, but either they use different op amps, or I am missing 1 op amp, or people in guides comment section just complain about the quality of the simple ones.
So is it possible to make an amplifier from the above posted ICs?
And if so does anyone know a schematic of a simple one that doesn't sound too bad.
Even as a complete electronic newbie I can follow schematics and datasheets. 😉
-rgds. Ice
I had a lot of free time the past few days so I decided to have some fun and try to make a portable audio amplifier, with speakers running on a battery.
I had a lot of electronic components acummulated over the years, unfortunately I've lost them all when i moved to the new apartment. So i had to start over by scavenging old electronics.
This is what i found:
c4558c - high perf. dual opamp (found in a keyboard i got 15 years ago 😀)
jrc 4558d - dual opamp from some pc speaker system
tda2030a x2 - 18W Hi-Fi amp & 35W driver
lm358 x2 - opamp
3472c x4 - High-slew-rate, single-supply op amp
Few hundreds of different capacitors, resistors, inductors, some diodes and transistors.
Audio jacks, leds,lot of other surface mounted stuff that i didn't want to desolder and other unknown ICs.
The past 2 days I was researching a lot about it, and found a lot of guides to build one, but either they use different op amps, or I am missing 1 op amp, or people in guides comment section just complain about the quality of the simple ones.
So is it possible to make an amplifier from the above posted ICs?
And if so does anyone know a schematic of a simple one that doesn't sound too bad.
Even as a complete electronic newbie I can follow schematics and datasheets. 😉
-rgds. Ice
Basic TDA2030 stereo amp with single 12V supply would do fine................
Thos other IC's are maybe suitable for motor drive.
Transistors? how many what types? Some of them are suitable for audio?
I
Thos other IC's are maybe suitable for motor drive.
Transistors? how many what types? Some of them are suitable for audio?
I
Not exactly a direct answer to a direct question. 🙂
What you will find is a lot of the old equipment that used to be floating around just isn't around nowadays. Tape mechanisms, FM receiver sections, good vinyl is mostly gone. What it has been replaced with is mostly MP3/Walkman type stuff that already has line level output. IMHO this has limited the op amps to a main role of level matching, tone controls and/or headphone amplifiers.
The TDA2030 are a fairly old design with good sound performance. Their down side is they are old technology and not very efficient. They are better suited for use in things like car stereos or stationary applications like driving speakers from your computers sound card. They draw so much current, with the volume *off* they would drain a 9V battery in less then 2 hours.
With the parts you listed, I think you would be best served if you started by using the loose parts to build a small power supply. Any transformer, preferably 12VAC center tapped, would work. Of course you could use a 12V DC wall wart but I get the impression you want to get your skills up. Building a general purpose bench power supply for experimentation is the first step. You should also invest in a Harbor Freight $5 DVM too if you don't have one.
It depends on the transformer you use, the two designs you should look for are TDA2030 with 'single ended supply' and the recommended 'split supply'. They should have both in the datasheet pdf. If you find a center tapped transformer, by all means build a split power supply as they are much more versatile.
It's also possible to use an old computer power supply as a bench supply *BUT* they are geared more towards delivering 5V at huge power levels what audio amps like. They are typically pretty weak on their -12V supply, less then an amp output.
What you will find is a lot of the old equipment that used to be floating around just isn't around nowadays. Tape mechanisms, FM receiver sections, good vinyl is mostly gone. What it has been replaced with is mostly MP3/Walkman type stuff that already has line level output. IMHO this has limited the op amps to a main role of level matching, tone controls and/or headphone amplifiers.
The TDA2030 are a fairly old design with good sound performance. Their down side is they are old technology and not very efficient. They are better suited for use in things like car stereos or stationary applications like driving speakers from your computers sound card. They draw so much current, with the volume *off* they would drain a 9V battery in less then 2 hours.
With the parts you listed, I think you would be best served if you started by using the loose parts to build a small power supply. Any transformer, preferably 12VAC center tapped, would work. Of course you could use a 12V DC wall wart but I get the impression you want to get your skills up. Building a general purpose bench power supply for experimentation is the first step. You should also invest in a Harbor Freight $5 DVM too if you don't have one.
It depends on the transformer you use, the two designs you should look for are TDA2030 with 'single ended supply' and the recommended 'split supply'. They should have both in the datasheet pdf. If you find a center tapped transformer, by all means build a split power supply as they are much more versatile.
It's also possible to use an old computer power supply as a bench supply *BUT* they are geared more towards delivering 5V at huge power levels what audio amps like. They are typically pretty weak on their -12V supply, less then an amp output.
Just noticed that half of the transistors have broken pins, so there are not many left.
c9013
bc337
bc327
s9014
ws78L09
ws78L05
tL431
78L05
The last few are VRs.
The battery I wanted to use is a 12V one from a drill, just gotta ensure that it wont be too strong for some of the components 😉
But it doesn't matter how quick it will drain the battery, as long as it works.
I had an old pc PSU in mind, but I'll probably make myself one. Just for the feeling when you know you made it yourself 😀
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