Multifunctional amplifier for contacting mike and needle mike
KAB-7


Outline
  • It was made to hear also with the needle mike by greatly improving the current one.
  • An efficient amplifier to make it hear with a double earphone (for both ears) by amplifying both parties the contacting (vibration) mike or needle (injection needle) mike. A special electric circuit (equalizer) that corrected the characteristic of the mike respectively was installed. It switches with an upper switch and it uses it. A red point is a contacting mike, and the other side becomes a needle mike.
  • The one to apply the contacting mike (A faint vibration is picked up) to a concrete wall and to hear the conversation of the next room. The needle mike is used to penetrate to the opponent of the thick wall with an injection needle of ten-centimeter length (1.5 millis in the outside diameter) and to hear the conversation of the next room. The option and there is an injection needle of 20 centimeters, too. (\3,000)
  • Even if the sound that beats the wall comes, it doesn't strike close to home to the ear because ALC (To hear it, the sound with large small Automatic Level Control sound (voice) also controls it automatically in the ear by the same size) circuit is built into. Moreover, it doesn't collapse ..a large sound (voice).., it distorts, and I hear it plainly.
  • Because the band-pass filter circuit that takes out only voice grade (300hz-3000hz) is built into surrounding even if there are a lot of noises, it is possible to catch it plainly.
Directions
  • Does the plug terminal of the contacting mike of the attachment or the needle mike to the input terminal in front of the main body. The switch on the side is set in either. It sets it in there is a red point for the contacting mike. It sets it in opposite for the needle mike. Next, front volume adjustment switch (VOL) is adjusted to the position of 0. And, the earphone of the attachment is difference all-in in Jack on the side. In addition, VOL is adjusted until the detection part of the contacting mike is applied to the wall, and the sound of the earphone becomes a suitable volume. It has it by the hand, and because it becomes difficult to hear by a little vibration's becoming a large noise, the contacting mike is fixed with the packing tape and used. The needle mike penetrates there if there are about 2milli hole and is used. A concrete wall is inserted in the spaces among the piping of the outdoor machine of the air-conditioning machine and the light line, the wiring for the phone wire, and the piping of water service and drainage, etc.
  • It is possible ..distinctness degree.. to do by operating the filter circuit when there are a lot of noises in surroundings. The characteristic of the filter can be selected with the switch of the sign of A, B, and C on the side on the power on/off switch and the other side. A hears of the sound that state and C of one CR high-pass filter step passed the CR filter and the band-pass filter ..flat characteristic without the filter and B... Please decide the best position suitably while hearing it.
  • If the slide is done back, changing the battery sees the battery the battery lid on the back of the back. It is noted that it doesn't make a mistake in the polarity. Two dry batteries of U5 are used. In addition, it is possible to use it for a long time by using the alkaline battery.
Specification of KAB-7
      Multifunctional amplifier for contacting microphone and needle microphone
      Detection frequency band region 150hz-5000hz
      Range 35db of ALC
      CR high-pass filter -6db/Octab Cut off frequency 200Hz
      Band-pass filter characteristic 300hz-3000hz -20db/Octab
      Use battery U5x2
      During 100 hours in the continuous use time(The alkali dry battery is used. )
      Externals size 73x26x14mm
      40g in weight
Notes
  • By any means, with a finger, please touch the projection portion for detection of a contact microphone, or do not poke it.
  • A hypodermic needle microphone can remove a hypodermic needle and the main part of a microphone. Since a compensation circuit which attaches the hypodermic needle and becomes best in the state operates, the characteristic of a microphone will become amusing if a hypodermic needle is removed.
  • When not hearing it, the switch of a battery is surely cut. When you do not use for a long period of time, please take out a battery and place it. Internal parts are damaged when a battery carries out a liquid leak.