A compact stereo amplifier based on the TDA2050.
SMD components were taken from TV boards.
The circuit board is from an old project of mine, I had to cut to adapt.
I managed to buy the CD2050CZ manufactured by SEMICO.
These are the printed circuit boards I had to adapt.
After some adjustments.
SMD components were taken from TV boards.
The circuit board is from an old project of mine, I had to cut to adapt.
I managed to buy the CD2050CZ manufactured by SEMICO.
These are the printed circuit boards I had to adapt.
After some adjustments.
TDA2050 is obsolete and you can only get copies of the original these days.
Original TI LM1875 is, on the other hand, active and pin compatible.
There are many examples of P2P build on the net without the need of PCBs :
Patrick
Original TI LM1875 is, on the other hand, active and pin compatible.
There are many examples of P2P build on the net without the need of PCBs :
Patrick
I mounted the amplifier on an SMPS power supply, it is running at ±13.6 volts. (this is tentative and just for testing purposes).
The heatsink is also temporary.
Grounding of audio signal and gain resistors is separate from grounding of decoupling capacitors and zobel network.
The negatives of the speakers come directly from the power supply, like grounding the heatsink.
I made a temporary volume control to test.
It has excellent audio quality even with power limited by the power supply.
No noise of any kind, even when the audio signal source is a notebook.
Soon I will test with the LM1875T.
I will provide a transformer to make a power supply that is between ±16 to ±18.
The heatsink is also temporary.
Grounding of audio signal and gain resistors is separate from grounding of decoupling capacitors and zobel network.
The negatives of the speakers come directly from the power supply, like grounding the heatsink.
I made a temporary volume control to test.
It has excellent audio quality even with power limited by the power supply.
No noise of any kind, even when the audio signal source is a notebook.
Soon I will test with the LM1875T.
I will provide a transformer to make a power supply that is between ±16 to ±18.
I am aware of all the facts.
Point-to-point assemblies are often limiting and difficult to modify.
I bought a 12+12VAC @ 5A transformer and built a ±17VDC power supply.
TS15P05G rectifier bridge and 4 capacitors 4700uF × 35V along with some other components.
I made some changes to the amp as well, changed the gain, added a low pass filter on the input and switched between other components.
Everything working great.
No oscillations, no noise, good bass and treble.
An LM1875T is on the way for comparisons.
TS15P05G rectifier bridge and 4 capacitors 4700uF × 35V along with some other components.
I made some changes to the amp as well, changed the gain, added a low pass filter on the input and switched between other components.
Everything working great.
No oscillations, no noise, good bass and treble.
An LM1875T is on the way for comparisons.
I know it's an old threead, but some observations and ideas. I am using this amp for long time, really loving the way it sounds.
However, about the last schematic: The 4.7 nF at the input seems to be a bit "highish", together with the 2.2 ohm 470nF Zobel at the output it might compromise the HF response. In mine the input parallel cap is 470 pF, the Zobel is made of 10 Ohm and 220 nF capacitor. Also the 47 uF in the feedback ground path should be a bit larger, and must be bipolar type. In my case it is 100 uF 16V Nichicon Muse. The whole thing is point-to-point wired without PCB.
My amp runs on +/- 20V supply, powered by a 100 VA toroid, Schottky rectifiers and 10.000uF 35V Gold Tune electrolytics.
I built lots of amps in the past 20 years, all types, (SE Mosfets by Nelson Pass, PP with BJT-s and V-Fets, Hybrids, etc.) but I found it really difficult to beat the sound quality of this one. Specially at this price range as far as parts cost is concerned.....
Sometimes it is hard to believe how good this thing can sound - of course within its power range.
However, about the last schematic: The 4.7 nF at the input seems to be a bit "highish", together with the 2.2 ohm 470nF Zobel at the output it might compromise the HF response. In mine the input parallel cap is 470 pF, the Zobel is made of 10 Ohm and 220 nF capacitor. Also the 47 uF in the feedback ground path should be a bit larger, and must be bipolar type. In my case it is 100 uF 16V Nichicon Muse. The whole thing is point-to-point wired without PCB.
My amp runs on +/- 20V supply, powered by a 100 VA toroid, Schottky rectifiers and 10.000uF 35V Gold Tune electrolytics.
I built lots of amps in the past 20 years, all types, (SE Mosfets by Nelson Pass, PP with BJT-s and V-Fets, Hybrids, etc.) but I found it really difficult to beat the sound quality of this one. Specially at this price range as far as parts cost is concerned.....
Sometimes it is hard to believe how good this thing can sound - of course within its power range.