. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. POWER PACKS More output and better regulation may be obtained with a device described by Attree^" wliich is primarily a stabilizer having an output, but which can easily be arranged to give This uses two beam tetrodes arranged as a screen-coupled multi-vibrator to generate square waves at 2 kc/s. These are transformed to the voltage required for the output, and are also used to. Mains in oN Figure heat the cathode of a saturated diode, the anode current of which contro
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. POWER PACKS More output and better regulation may be obtained with a device described by Attree^" wliich is primarily a stabilizer having an output, but which can easily be arranged to give This uses two beam tetrodes arranged as a screen-coupled multi-vibrator to generate square waves at 2 kc/s. These are transformed to the voltage required for the output, and are also used to. Mains in oN Figure heat the cathode of a saturated diode, the anode current of which controls, via a valve, the power supplied to the multi-vibrator {Figure ). In this manner the output voltage is both back-stabilized (output impedance 0-03 ohms for 6 V output) and forward-stabilized (0-1 per cent change in output for 10 per cent change in mains): the power output available is 10 W. Because of the high frequency and the square waveform this Rectifier HI and smoothing /Circuits Stabilized / o o ^ 1 dc. out ^ 1 < < < > > Multi -vibrator i ^ - 1 J\ 1 ? Control valve Sat \ . diode Figure supply is particularly easy to rectify and smooth; Attree suggests the use of a single 100 mH choke (actually, the secondary winding of a small loud- speaker transformer) and capacitors of 50 and 1,000 /j,F. At 2 A output the ripple is then below a millivolt; unfortunately 3 W are lost in the recti- fication and smoothing process. A recent device of promise is the electrolytic smoothing and stabilizing cell, manufactured by L'Accumulateur fitanche S. A. of Brussels. A heater 596. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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