MIC到家后怎么办？

hb-wu

怎么安置那个小MIC大家有什么想法？是弄根筷子顶上就行了？谁能画画图？谁能代加工？

电子管收音机

对！这个事情我也一直在思考，该如何安置那颗黄豆豆呢？来个圆管把MIC塞进去，外表再来装修一下，那MIC怎样接线才是最好的？放大电路选用哪个是最为合适.........?

电子管收音机

还是用回这个好呢？

电子管收音机

来个管子把它顶起来？

janorwa

作个固定架，把他安装到一个小型架子上 我想这样比较好  不容易弄坏 也能很好的固定

liyusheng

电子管收音机 兄，还有没有什么mic放大器的电路，多放一些，放大倍数，素质高一些的。我测量的时候用50cm的距离测量，软件实际收到的信号已经很弱了。至于mic往哪里放？我的是用电脑上用的mic，去掉原来的头，用热缩管把mic和塑料管（跟下图的管子差不多）紧在一起。

ljxdw21

看看mic的大小！！

ljxdw21

看看连线！！

ljxdw21

This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This microphone preamplifier can take both dynamic and electret microphone inputs (preamplifier provides power foe electret microphone elements). The idea of this circuit is to keep the design as simple as possible to be easy to build. That was my goal when I needed a simple external microphone preamplifier for my mixer. The performance of the circuit is nothing superior but can be used with many not so serious projects.
The circuit is a simple one transistor amplifier with amplification of about 30-40 dB (depends on transitor, temperature and voltage). The dynamic mic input is just a simple one transistor amplifier circuit with nothing special in it. LED D1 is in the circuit to show that the circuit operates. The voltage drop caused by LED (around 1.8V for RED led) has been taten in account when designing the amplifier circuit built around Q1. Resistor R4 and capacitor C5 make a filter to filter out possible noise from battery or other power source which is used to feed this circuit. Capacitors C1, C2 and C3 are used to block the DC bias on Q1 base to flow out of microphone input to microphone (the polarity of all capactors is straigh line = + and curved line = -).
Electret microphone input has a resistor R1 fo feeding current through electret microphone capsule when it is connected to the electret microphone input. Electret microphone needs some current (about 1 mA) flowing through it to operate, because there is a small amplifier circuit inside the microphone capsule. This circuit is suitable for all typical cheap electret capsules which available from any electronic component shop. Because electret microphones have higher signal level output, it is quite easy to overdrive the amplifier when you shout to electret microphone.

ljxdw21

The circuit is bet to build to a small metal box like in the picture above. Put the 9V battery inside the case too. Battery power and metal box keep external noise and interference sources away. I used standard 6.3 mm jack for dynamic microphone and 3.5 mm mono jack for electret micrphone both installed to from, panel of the metal box. The LED and power switches are also installed to front panel.