. Electronic apparatus for biological research . Figure capacitor via a buffer transistor. The capacitor is discharged by a meter, whose reading is therefore proportional to the rate at which R waves arrive. Wolfendale, Morgan and Stephenson^^ have reviewed the use of transistors as computing elements, and include a decade counting circuit. Blake and Eames^^ have described a frequency meter for the range 0 to 100,000 counts per second. The count rate is indicated on a meter having a linear scale. The device is sensitive to input pulses only 60 mV in amplitude, corresponding to a current
. Electronic apparatus for biological research . Figure capacitor via a buffer transistor. The capacitor is discharged by a meter, whose reading is therefore proportional to the rate at which R waves arrive. Wolfendale, Morgan and Stephenson^^ have reviewed the use of transistors as computing elements, and include a decade counting circuit. Blake and Eames^^ have described a frequency meter for the range 0 to 100,000 counts per second. The count rate is indicated on a meter having a linear scale. The device is sensitive to input pulses only 60 mV in amplitude, corresponding to a current of 12 ^A. The accuracy claimed is ±1 per cent. REFERENCES 1 Bardeen, J. and Brattain, W. H. Phys. Rev. 74 (1948) 230 2 Cocking, W. T. Wireless World 61 (1955) 500 3 Oakes, F. Wireless World 61 (1955) 164 * Stuart-MoNTEiTH, G. Electron. Engng. 28 (1956) 544 ^ Jones, D. D. and Hilbourne, R. A. Transistor Amplifiers London; Iliffe « George, R. E. Proc. Vol 7, No. 4 ' PoTOK, M. H. N. and Wales, R. A. McF. Electron. Engng. 11 (1955) 344 8 Johnson, G. Wireless World 61 (1955) 31 9 Neale, D. M. and Oakes, F. Wireless World 62 (1956) 530 1" Fleming, L. Electronics 30 (1957) No. 1 11 Moody, N. F. Electron. Engng. 28 (1956) 94 12 SuTCLiFFE, H. Electron. Engng. 29 (1957) 140 13 Burton, P. L. Electron. Engng. 29 (1957) 394 14 Johnston, D. L. Wireless World 60 (1954) 518 1^ Mullard Technical Communication 2 (1956) No. 17 1^ Light, L. H. and Hooker, P. M. Proc. Instn. elect. Engrs. Pt. B, 102 (1955) 775 " Light, L. H. Wireless World 61 (1955) 582 1^ Nambiah, K. p. P. and Boothroyd, A. R. Proc. Instn. elect. Engrs. Pt. B, 104 (1957) 293 709
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