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CJB-1 tape recorder channel multiplier Development


Percent. Figure 4 shows the clock frequency playback circuit waveforms of the output point of work. Bs were a hundred n! N =: n. , Dual-frequency control was switched capacitor filter circuit consists of s '1 n5n Lei Qi, the output of the clock pulse FC can automatically control the switching frequency in Figure 4 the main channel clock waveform playback off main circuit filter cutoff frequency, the frequency clock frequency of about record Fig. W & Vfa. rm. The circuit is relatively simple, working principle and the main figure 5-channel recording circuit diagram Fig. 5Fencttondi-grImafth at sltech Ⅲ eIrordjrO Ⅱ jt pigsty Figure 6 channel amp circuit diagram Fig. 6F'iondi-gr-dish of'heElmeh'nttlreay. ircuit major technical indicators tape drive channel multiplier achieved the main technical indicators are as follows, Square-wave response (WBFM mode); 8. String by interference; the main channel not less than 33db; vice channel not less than 34db2 々 g3. Distortion factor (WBFM mode), 20Hz is not greater than 1 when cracking; work not more than 3 pass-band cracking 4. Fluctuations (WBFM way). 7. Channel multiplier input voltage 0.5 · 1,2,5 Vp fourth gear 8. Tape input voltage t1oVp9. Drive output voltage t1VplO. Pass by the output voltage multiplier; lVp11. 1 min WBFM work and play back the results of two recording IBFM the instrument with the other models in Japan SonyA-69 8 was used to match the tape recorder, the results show that the various technical indicators have reached the design requirements, and has a stable, reliable, simple operation. Figure 7 matching records for direct recording and comparing the results of the various waveforms. Thus, the two are basically the same, with good effect. In the steady state of simulated weightlessness on responses of visual study, we selected the channel multiplier WBFM work, square building '40Hz 『-] plant] was built a few square triangular jUUL Ji H eighty-eight thousand eight hundred eighty-eight are stupid eight thousand eight hundred eighty-eight eighty-eight 100l-lz. Potato teeth . / / / / / / / / 1 / / / Li Ji Jian eight / ' eight hundred eighty-eight / /,, Figure 79. Sc ~ / s waveform comparison test records rig. TTbtCamliilitive - · ~ olrmlofellierimentilr · ~ ord! It0. ScB/I3T5 scorpionfish ~ 4O port 0 Po stare stare song ~~~~~ 0000O ~ eleven thousand one hundred and eleven 2} d while 12 were recorded signals, of which 8 lead EEG (EEG), 2 guided eye movement signals (EOG) and 2 lead flash intensity signal. Figure 8 shows the experimental waveforms of the recorded results show that a variety of recorded biomedical signals in full compliance of requirements. 『Feeding optical signal 1 ~ / n / IX ~ 1n『 n IX n IX n / IX 『1.1l6I. 166lIIlIl6Il. - Set the signal Figure 8l2 Road signal recording waveform Fig. 8Threcor41ag_ ● veJ0rmforsr0r】 2chtn Ⅱ el. Conclusion According to the principle research Pina hours drive from the multiplier can pass by the tape recorder is used the number of the pass was doubled. It has stable performance, reliable, easy to use and so on. Frequency response of the tape drive itself is limited, so that the maximum frequency of the recording system has declined, but it can not record the distortion is 0 ~ 340Hz frequency response range of a variety of physiological signals, to meet the most basic use of low-frequency physiological signals requirements. Therefore, the drive through the development by a multiplier, not only meet the needs of scientific research, but also give full play to the role of the existing tape drive. Thus save research funds.