The portable notepad tape recorder (voice recorder) was developed in 1964.
For people of many professions - journalists, students, doctors - a portable tape recorder will surely be able to replace a familiar notebook.
The dimensions of Notepad are 145x82x37 mm, weight 600 g.
Recording is done on type B tape, with four narrow recording tracks placed on one tape.
Due to this, with a cassette capacity of 40 m, the total length of the phonogram is 160 m. The average speed of the film is 3.5 cm / sec, and the playing time of one cassette is about an hour.
The transition from one track to another is carried out automatically, using a mechanical system.
After the last, 4th track ends, the tape recorder turns off.
The main feature of the CVL is its extreme simplicity.
There is no drive shaft and pinch roller.
Rotation from a miniature electric motor is transmitted directly to the left or right sub-cassette, on which the film cassettes lie.
With such a system, the speed of the film changes somewhat during the recording process: the film moves the faster, the more it is on the master cassette.
This shortcoming can be forgiven "Notepad", as it is designed only for recording speech.
If the tone of the recorded voice is distorted, you can change the speed using the simplest knob.
The electronic part of the tape recorder is made on 6 transistors.
4 of them work in a universal recording-playback amplifier, and 2 others - in the magnetization and erase generator block.
Listen to recordings via a regular headphone.
When recording, it switches to the input of the amplifier and acts as a microphone.
The amplifier and motor are powered by miniature rechargeable batteries with a voltage of 5 volts.
After 3-4 hours of continuous operation, they must be recharged.
For this purpose, a small power supply unit is made on the power supply unit, which allows you to simultaneously recharge two sets of batteries.
This unit recorder can be powered by AC.
Serial production of a tape recorder (a prototype was demonstrated at VDNH) would be very useful.[null,null,ru