Portable tape recorder "Notepad" (dictaphone).
Reel-to-reel tape recorders, portable.Reel-to-reel tape recorders, portablePortable tape recorder "Notepad" (dictaphone) was developed in 1964. For people of many professions - journalists, students, doctors - a portable tape recorder will certainly be able to replace the usual notebook. The dimensions of the "Notepad" are 145x82x37 mm, weight 600 g. The recording is carried out on a "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 film speed 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 or pinch roller. Rotation from a miniature electric motor is transmitted directly to the left or right cassette holder, on which there are film cassettes. With such a system, in the process of recording, the speed of the film movement changes somewhat: the film moves the faster, the more it is on the leading cassette. This shortcoming can be forgiven for "Notepad", as it is designed only for speech recording. If the timbre of the recorded voice turns out to be 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-reproduction amplifier, and 2 others - in the block of the bias and erase generator. They listen to the recordings through a regular headset. When recording, it switches to the amplifier input and acts as a microphone. The amplifier and motor are powered by miniature 5 volt rechargeable batteries. After 3-4 hours of continuous operation, they need to be recharged. For this purpose, a small power supply unit, made on a p / n, is used, which allows you to simultaneously recharge two sets of batteries. With this unit, the tape recorder can be powered from the AC mains. A serial production of a tape recorder (a prototype was demonstrated at VDNKh) would be very useful.