TA7668 tape recording and playback preamplifier board
Product description:
Adopt TA7668 head recording and playback dedicated chip design (original disassembled chip, don’t buy it if you mind), old-fashioned tape drive, dedicated for deck head amplification. Both playback and recording are used. The recording signal input can be connected to the audio output of computers, mobile phones, mp3 and other equipment for recording, and the audio erasing adopts the AC degaussing erasing method (the effect is better than permanent magnet erasing and DC erasing, clean and thorough). The power supply has a rectifier circuit, which can be AC input or DC input.
When recording with a permanent magnet erasing head, there is no need to connect the AC erasing circuit (the erasing effect will be a little short, it is recommended to use the AC erasing head movement)
Recording and playback dual-purpose wiring method:
the magnetic head is connected to the IN-CT interface, and out is the audio signal output terminal (the pre-play output is connected to the power amplifier board, and it can also be used for monitoring the recording input signal during recording) IN is the recording audio signal input (Only use in recording mode. Note that the input signal should not be too large, otherwise the recording will be distorted. You can first adjust the recording signal to a very small state and input, and then listen to whether the speaker sound is distorted. If distorted, the input signal is too large and needs to be reduced. , Repeatedly adjust until the sound is normal and you can start recording.
Specially used for recording: connect the magnetic head to the LY interface, switch to the recording mode, and directly input the audio signal (the input signal debugging method is the same as the recording and playback mode).
Working voltage: AC: 8-16v or DC: 12V-24V
Board size: length, width and height 100mm*50mm*23mm
Board: Three 300mm long signal lines and one 300mm long AC wiper cable are distributed
Note: The recording and playback switch is manually switched by default (pressing the switch is the recording mode, and vice versa is the playback mode). If you have strong hands-on ability, you can change the core recording button control
Step 1: Remove the self-locking function of the recording and playback switch, just change the direction of the hook of the switch. The operation needs to be very careful not to remove the hook, or it will be useless.
The second step is to fix the board and place the switch part on the recording key switch to make the recording and playback switch work normally.
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