Amplifier design FAQ Amplifier design FAQ |
Homemade speakers and sound amplifiers Note: a sample instruction for assembling an amplifier on Burr-Brown OPA microcircuits is
here.
The fundamental difference between the chips in this FAQ:
TDA2822m -
for speakers ;
TDA7050 -
headphone .
TDA2822m based amplifier
pin layout (chip marking up)
chip parameters
bridge start
When the bridge is switched on, only the output power changes:
typical switching circuit
visual scheme
Yellow circles with a black symbol - the place to connect the speakers
Gray circles with a yellow symbol - signal input
Pink circles - the place where the wires are connected (wire crosses without a pink circle - this is a wire cross: there is no need to connect them!)
This scheme can be assembled as a mounted installation, and on the board. For this we need the following details:
Chip
TDA2822m - 1 PC.
Resistor
10 kΩ - 2 pcs.
Resistor
4.7 ohms - 2 pcs.
Electrolytic capacitor
100 uF 16 V - 2 pcs.
Electrolytic capacitor
470 uF 16 V - 2 pcs.
Electrolytic capacitor
10 uF 16 V - 1 PC.
Ceramic non-polar capacitor
0.1 μF - 2 pcs.
However, the scheme can work with a minimum set of radio components:
Electrolytic capacitor
100 uF 16 V - 2 pcs.
Electrolytic capacitor
470 uF 16 V - 2 pcs.
When assembling, let's say a small deviation from the tabular values of parts according to the rule “more is better” (say, instead of a capacitor of 470 microfarads, put 1000 microfarads).
If after assembly the amplifier wheezes - check the correctness of soldering, supply voltage, input power (is the input volume too loud?)
With proper assembly and serviceable radio components, the amplifier can not work. Capacitors have polarity, pay attention to how they are soldered!
TDA7050 based amplifier
pin layout (chip marking up)
typical switching circuit
visual scheme
Yellow circles with a black symbol - the place to connect the speakers
Gray circles with a yellow symbol - signal input
Pink circles - the place where the wires are connected (wire crosses without a pink circle - this is a wire cross: there is no need to connect them!)
This scheme can be assembled as a mounted installation, and on the board. For this we need the following details:
Chip
TDA7050 - 1 PC.
Electrolytic capacitor
100 uF 16V - 2 pcs.
When assembling, let's say a small deviation from the tabular values of parts according to the rule “more is better” (say, instead of a capacitor of 470 microfarads, put 1000 microfarads).
If after assembly the amplifier wheezes - check the correctness of soldering, supply voltage, input power (is the input volume too loud?)
With proper assembly and serviceable radio components, the amplifier can not work. Capacitors have polarity, pay attention to how they are soldered!
Post has been editedBlack fish - 21.01.16, 18:00Reason for editing: Added link to BB