Amplifier For Turntable
We present a montage "retro". This circuit was essential listening for years to correct our vinyl records. Preamplifier all know what is but what is that the RIAA?. The RIAA is "Recording Industry Association of America," or that Castilian would be the "Recording Industry Association of America. " This association suggested some corrections at the time of recording and reproducing the vinyl for the sound quality of them was better. The correction became standard. Therefore, everything had to be equalized turntable with that correction. The idea came to us. because I wanted to hear those old vinyl. The problem is that our amplifier for turntable has a phono input, and therefore do not have the RIAA corección So we got down to work and this is the result. The output of our circuit we can now connect to an auxiliary input of the amplifier. The circuit is built into the inside of the turntable, and we used the same power supply to feed our circuit, which consumes only 20mA. The wiring diagram is very simple, consisting of an integrated circuit and a few components. The integrated circuit may be a NE542 or LM387, either served, are double low-noise operational amplifiers. The only requirement is that must be fed with 15 volts. The resistors and capacitors R2, R3, C5, C6 are the RIAA correction filter This filter is nothing more than following the curve of the graph. The diagram and the circuit must be in the same folder and just called, will only change the extensin sch and brd for the scheme for the board, so are recognized and associated with the Eagle. For reasons of space we had to put the electrolytic capacitor 1. 500uF lying not to stick with the top of our turntables. As you can obsevar in the photo on our circuit board we have a ground plane, ie with the negative pole Cubiro as much copper on both sides. This gives a better shield against hum. If you can not make a ground plane, see our tutorial on creating a ground plane in Eagle. Test the compatibility of the two integrated circuit assembly. Both the NE542 LM387 as smooth can be used with a voltage of 15 volts. . . In the key words that take you on this blog, I often read "build a tube amp with a amplifier for turntable (or radio) 1 . . . No one gets that the transformers in the best case. Often the transformer output is not suitable for guitar amplification and therefore, only the transformer. The thing is identical with phonographs. A record player in working order, it's a collector's item that can be nice to exhibit in her living room. - Do not rely on the lights. Although they can still function for years, and you do not know the risk is unnecessary . . - In an amp like a Bouyer, you can retrieve the two transformers to to make a 30 watt amp. But again, you do not know if the transformers are functional and these. - The lamps are to forget for the simple reason that the individual did not buy an amp for Bouyer s 'use it occasionally. Basically, buy one. Bouyer old amp or Geloso is buy an amp whose lamps have a 50% chance of being permanently flushed. If they are perfectly functional, it's a plus, but do not count. Turntable to an amplifier requires heavy modification of the scheme. Indeed, the output level of a guitar is much lower than that for which the amp. In short, with the exception of some models such as Dual Dualophon or GID (no need to write me to ask me the list of devices that are worth, I. Know that there are excellent amp kits quality, with reliable and new parts for just 150 euros. The basic kit of Amp-maker available here. Basically, do not break your head with parts salvaged from right to left, unless the price defies . . . .
