Usb Microphone Condensers & preamp?
If my condenser Mic has a usb outlet that hooks up to the computer, Then how would I hook the mic up to a preamp???
You wouldn’t. Most USB mics have built in pre-amps.
Microphone for vocals running through guitar preamp?
Hi, just wondering about how bad it might be running a vocals microphone through a guitar preamp? I don’t have any other preamp and need to add some vocals. What are the main issues?
Should have put in the details. I’m using a Shure SM57 and Shure SM58 for the microphones. The preamp is a Baggs Para Acoustic d.i., the earlier version without the gain control. Obviously works great on guitar, but not so sure on vocals…
The problem is that a guitar amp has a hi impedance input and will probably have an input gain circuit which will provide vast amounts of distortion which is ok for rock guitar but useless if you want your voice to sound good. You don’t say what guitar amp you have. Most good mics are lo impedance and will not drive the hi impedance input of your guitar amp. If you do find a hi impedance mic you will probably have so much gain you will get loads of feedback. Do not confuse gain with volume. They are not the same.
Conversely, you cannot input a guitar into a mic input and get anything like a good noise.
I suggest you try to source a small public address amp (at least 100w) maybe on ebay. Look for something with a reverb at least, if not digital delay.You will also need at least one pa speaker. Don’t try and use hifi type speakers, you will damage them.
The mics are fine. The 58 is a good vocal mic for anyone starting out. The 57 is usually used to mic up instruments – you see them hanging in front of guitar amps.
Can an Incandescent bulb be switched out for an LED?
Can a 28v Incandescent bulb (part # 1016131189) be switched out for an LED? I would like to switch out the lamps that have burnt out in one of my outboard microphone preamps with something permanent, so I don’t have to change them again in the future.
I think you are asking if you can replace an incandescent bulb with a LED.
Yes, you can, but the LED will require a dropper resistor in series to limit the current (and voltage) to a useable limit.
Another possible problem is the 28V could be AC, not DC as the LED requires. If AC you would either need to convert the source to DC using a rectifier, or insert a diode in series with the LED (each LED) to rectify it.
You need to find the specs. For the LED you wish to use, and look up the voltage and current rating.
Then using Ohm’s Law, you can calculate the ohmic value of resistor you need to drop the 28V to the LED voltage (use a meter to measure the actual voltage on the bulb socket, it won’t necessarily be 28V).
R = E/I, where R is the resistor value in ohms; E is the voltage DIFFERENCE between the supply and the LED voltage, in volts; the I is the current suggested for the LED in AMPS.
So if the LED required 20 milliamps @ 3Volts, and you have 28V supply,
R = E/I = 25/.030, which is 833 Ohms.
A quick check for the wattage rating of the resistor,
W = E X I = 25 x .030, which is .75 Watts. So you would use a 1 watt rated resistor of 833 Ohms value.
You may find difficulty finding a suitable place to insert the resistor. It will get a bit warm, but not seriously hot.
If you use a diode to rectify AC, the additional voltage drop across thediode will be about 1.2 Volts. You subtract this from the supply voltage first, then calculate the difference between that figure and the LED voltage required.
Is there a store in NYC where you can listen through and compare multiple microphone preamps?
B&H only lets you compare microphones…
Thanks but no, J&R does not carry any of that sort of equipment…
Argh, please read the question, I told you B&H only lets you compare microphones…
You could try J&R down by city hall…
I want to amplify a microphone but what do i plug it into?
all i can find for microphones are preamps but i dont understand them. will a guitar amp or speaker work?
Yes, i use my guitar amp for my microphone. All you have to do is buy the connector so you can plug it in. I think they cost about ten dollars.
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