![]() ![]() I will look into designs based on the LM386 or the TI chips. It sounds like I need to build 4 separate mono amplifiers. Hello AnalogKid, thanks so much for your reply! I do see the extra complexity, but I feel like your answer has helped clarify some things. An alternative is electronic pots using specialty chips from Maxim.īy tradition, signals on a schematic flow from inputs on the left to outputs on the right. The least complicated way is a 4-gang pot, but those are not common, especially in low quantities. Since you want independent control of all 4 signals, you will need 4 mono amps instead of two stereo amps. Without those numbers, there really cannot be any circuit recommendations.įor small speakers and table radio loudness, there are many amplifier modules on ebay based on the LM386 audio power amp chip or some Texas Instruments class D audio amp chips. You don't say what the signal level is out of the microphones, or what power level you want to drive the speakers. Mixing the four signals to a single output is not difficult, but it is another layer of circuit complexity. For example, the switching jack outputs "all 4" signals. You need to work through the consequences of your requirements. Please let me know if I can clarify anything or provide more information. How and where in the circuit do I add a global volume control and switching jack? What type of amplifier design would work? Can I use a single amplifier? Any guidance on sources for schematics I could build or modify would be great.ģ. I am hoping the amp design I use in this project will match impedance without the use of a separate preamp.įinally, the piezos will be primarily picking up percussive-type noises, so this does not need to be audiophile quality by any means, but good sound is important.ġ. In a previous project I soldered a small impedance-matching preamp for a piezo disc mic that I plugged into a guitar amp. It seems like it would be more efficient to use a single amplifier, but I am getting stuck on maintaining 4 independent signals, except for the global volume and switching jack (which I suppose would require a summing mixer before the signal is sent to the jack?). I could build 4 discrete amplifier units, but as you can see in the diagram, I would like to add a global volume and a switching jack. Most of the amplifier designs I have looked at online and in Forest Mims' book assume a stereo pair (or two), which is not what I want. I have attached a block diagram of sorts, which I hope is clear. #PIEZO PREAMPLIFIER ANALOG DEVICE IC FULL#Each microphone will be picking up a different sound, and I imagine the speakers will be 2-3" speakers (I've been told 8 ohm full range speakers might be a good choice). I would like to have 4 small piezo microphones independently amplified to 4 small mono speakers with volume control, mute, global volume, and a switching jack. I have a long way to go, so I am hoping someone can give me some guidance on a project I am working on now. It is not clear why you chose this IC and may be for the wrong reasons.Hello! I am an absolute beginner learning electronics by working my way through the Make:Electronics book by Charles Platt. However if you are trying to use an existing electret mic, this was not intended for this but rather just the cheap piezo element. If this is what you want, then simply follow the datasheet. Simulate this circuit – Schematic created using CircuitLabīEWARE that the purpose of this amplifier to make an integrated mic Amp with Enable/shutdown. Instead you may use a mono 3.5mm plug with typical desktop mic. but more likely a toy piezo element for integration together but maybe not using the same ground as this would shunt the -ve signal as the +ve side is already shunted by a cap. #PIEZO PREAMPLIFIER ANALOG DEVICE IC HOW TO#Unlike mono plugs this uses all 3 connections for better noise immunity I think but it is not clear how to connect. I think it assumes a stereo plug with the 2 tips being the mic polarized signal and the outer ground as a shield only. 200k/20k gives a gain of -10 with input from (Vin-) grounded and using non-inv input adds DC bias with the IC allowing Shutdown to save current. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |