You can use one TDA2822M IC and connect it bridged to one speaker for an output of 1.1W.
Then you can use a multi-pole switch to change it to stereo for headphones.
It is easier to use a second TDA2822M and use one channel for one channel for headphones and an output coupling capacitor on the output of the bridged TDA2822M for the other channel for headphones.
Look at the two circuits I posted in post #42 and write down the differences. A switch must cause all the differences. I think the switch will have many poles, too many. The switch inside a headphones jack is not complicated enough to do it.
The mic preamp can be connected to a switched jack so that it works when the radio is not plugged into the jack. When the radio is plugged into the jack then the mic preamp is switched off it and the stereo radio connects to the jack.
No.Enclosed is edit bridge circuit. kept 100k vol control pot but now resistor is directly tied to ground. Is this right!
No.What i think the differences are between the two circuits in post #42.
In the bridge circuit.
1. The two inverting inputs pin 8 and 5 are tie together with two 10uf caps to ground.
Yes.2. Pin 6 is tie to gound.
No.3. speaker added to its outputs to pins 1 and 3 . With cap on pin 1.
No.In the headphone circuit.
1. The two inverting inputs pin 8 is ground with 100mf cap and tie to ground the same for pin 5, But they are not tie together.
No.2. Pin 6 and pin 7 are your inputs. with 10k resistors.
Yes.3. pins 1 and 3 are your output this the headphones get connect to.with two 470mf caps.
Use a switch with enough poles. It might not be available.Even if i know the differences. How is this going to help me connect the two circuits together with a multi switch if i don't know how to connect them together. And what multi -switch are you referring to. You never mentioned what knid of switch this is.How would i know what switch to use.
The datasheet shows a max supply of 6V when the TDA2822M is bridged, has an 8 ohm load and shows how hot it gets. It does not get as hot when its load is 32 ohms so it can have a higher supply voltage.Can I use 9V on the tda2822m for the Power supply for both of these circuits, will the amp get HOT if i use 9V because the amp is rated from 1.8 to 18 volts VS?
Simply calculate the power in the pots. The TDA2822m has a max output of 1.4V RMS and a gain of 95. Then its max input is 1.4V/95= 15mV. The dissipation in each pot is 15mV squared/10k or 100k= almost nothing.1. The vol control pots for both circuits that I have are rated at 1/4W,will they be enough wattage in both circuits?
It will be very clear and very loud at max volume.2. Will the headpone amplifier circuit drive my 8ohm pair headphones with decent sound or will the sound be low at maximum volume.
The "Total Power Dissipation versus Output Power (Bridge)" graph on page 6 of the datasheet shows a dissipation of almost 1W when the supply is 6V and the output power is 1.1W into 8 ohms.3. I couldn't fine where it states the temperture in a bridge circuit at 8ohm load how hot the IC would get, do you know the page number where its at?
The toggle of the switch connects to the input of the volume control.4. Where would be the apporpriate placement to connect the plug to the switch back and fourth between the mics preamp output and to the radios output jack... Between the PreAmp and the headphone input then to the input of the speaker amp. OR between the PreAmp and the speakers amps input, then to the input of the headphones. Or dose it matter how its connected either way.
Only two positions: 1) The radio or MP3 player. 2) The microphone preamp.1.Why can't I use a On-Off -On position type of switch, to switch between the two circuits and between the preamp and the radio plug.
2.So your saying, all's i need is a On-On position type of switch. I don't need center off position on the switch to switch back and fourth between the circuits
It is easy to calculate since the datasheet shows the efficiency in figure 14:In the two circuits the TDa2822M bridge circuit and the headphone circuit what is the total current draw for both circuits. operating current drawn from the battery.100mA,200mA or more.
The circuits in post #42 have two capacitors that you added by mistake. The circuits in post #49 are correct and have good low frequency response.audioguru
So. Will the circuits work (as is) in post #49, and in post #42 that you posted and will the cut-off frequencies from low to high for the DTMF tones and for radio sound co-insde with the bass frequencies for my project as discussed in this thread.
Each ear of the headphones connects to the output of its amplifier and the common wire of each ear connects to ground as shown in the schematic with a headphones jack.Also. I need to know in post #49 do i I connect to one side of the Headphones amp output or both of the outputs to connect to the input of the decoder circuit in post # 6
The TDA2822M power amplifiers drive a speaker and headphones. The mic preamp drives the amplifiers and the decoder. Your decoder schematic already has an input coupling capacitor.The same gos for the outputs of the speaker in post #49 to the decoders input in post #6. Also, would i need to add a extra capacitor to both of the outputs before connecting them to the decoders input and what vulues would i need. Or no additional capacitors are needed.
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