Pre Amplifier – microphone preamp

Amplify Those Signals! Designed specifically for AM/FM radio reception, the K2622 provides 22dB gain between 10MHz and 150MHz. The sleek metal housing provides the necessary shielding and assures you of the least amount of interference. Input power is 12-15VDC at 2mA and can be powered directly or up the coax. Input/output impedance is 50-75 ohm. [...]

This is Pre Amp purpose of Circuit, a circuit that is easy to use and can be used to input various types of up to 4 inputs such as where a microphone that is sensitive signal about 50 mV. Position 2 for the tape. sensitive signal about 100 mV. position 3 for the tuner. Sensitive [...]

Integrated stereo surround sound will come out similar to the Concert Hall. And a simple circuit. Using the LM1458 IC number to expand the difference of the input signal left (L). It came out as surround sound sure enough. When raising the power and enter the left and right input circuit.The signal on the left [...]