The TDA2022M amplifier I show is a working power amplifier with an output power almost 5 times the power of an LM386 amplifier because it uses two amplifiers in a bridge so the voltage swing across the speaker is doubled.I have some questions about the two Amplifiers.
1. Why use the TDA2822M dual Power amp are you using one of the amps for feedback Please Explain! If you may. So i could understand this circuit.
Power amp.
2. Is this a workable circuit "meaning"' will it function (as is) if I connect the ouput of the DTMF Generator circuit to the input of the Power Amp.
The pot is a volume control. The datasheet for the TDA2822M shows that the gain is 95.3. I assume the gain is variable controlled throught the POT at pin 7, what is the total gain for this circuit.
The output power depends on the supply voltage. With a 6V supply the minimum power is zero and the max power barely clipping is 0.9W into 8 ohms.4. What is the output wattage throught the speaker when the Pot is at zero gain and at maximum gain by turning the pot.
Use a single turn logarithmic (audio taper) volume control or a single turn trim pot.5. Do I need to use a 10k rotary POT or can i use a 15 turn 10k trimmer POT.
5% carbon film resistors are fine.6. Do I use 5% carbon or 1% metal film resistors in Audio circuits.
The input coupling capacitor should be 220nF/5%/63V film type. Film capacitors are good for coupling low power audio.7.Capacitors C3,C1 are electrolytic, what are the rest of them mylar, ceramic, or other. What kind are best to use in audio circuits.
it is ready to be connected.8. Do I need to add any parts if so what parts would i need to add and there values before I conect the Power amp to the output on pin 16 on the Generator circuit, Or is it ready to be connected to the generators Output just the way you have it.
Simply connect them together.A few questions on the Mics Preamp circuit.
1. The Preamplifiers Output will be connected to the decoders Input do I need to take out any of the parts I have connected to the decodes Input. If not. I just connect the Preamps output to the decodes Input. As is. correct!
The max gain of the opamp is 1+ (470k/2.2k)= 215. The 470k pot is the gain control.2.What is the gain for the Preamp 20, 100, 200, or above that?
The TL071 is a low noise audio opamp. It is available everywhere, is inexpensive and works very well as a preamp.3. Why did you use the TL071 instead of say 386 0r 741, and is there a big difference in functions.
Think of a cutoff frequency (half-power) then use a simple calculation, don't guess wrongly.What size capacitor can i use and what capacitor size do you think will get those lower bass frequecies for the input capacitor, and not have to change the 10k pot.
Same as above.And what size capacitor can i use to replace the 1OOuf, if my earphone are 8,16 ohms and still rececive those lower bass frequencies.
With pin2 and pin4 connected directly to ground then the two capacitors do nothing because they are shorted.As for pin2 and pin4 the ground sign indicates there at ground. correct! don't i need the .01 coupling capacitors for noise. But please correct me if I'm wrong on that. but I do see your point that they should be directly to its ground state. would i still need to install those caps yes or no and where. Please advise.
The toggle of the two-way switch is at the volume control. the switch selects either the output of the mic preamp or the jack for the radio.I'm not understanding the last paragragh in your post how do i feed the plug coming out of the radio's earjack into the preamp by using a switch then to either the preamp to the volume control of the 386 or the radio. Can you show me this in a simple diagram so i can visualize what you mean so i can understand this better.
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