By Department of Defense
This instruction manual has been ready to be used via radiological screens in neighborhood shelters and at fallout tracking stations. Federal Civil protection advisor quantity, FG-E-5.9.
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Additional info for Handbook for Radiological Monitors
Sample text
A Regulated Bipolar Power Supply A regulated bipolar power supply is shown in Fig. 16. The positive side of the supply uses a 78xx regulator, while the negative side uses a 79xx regulator. Basic Vacuum Tube Diode Power Supplies 17 Fig. 16 Regulated bipolar power supply Negative regulators work the same way as positive regulators except for reversal of polarity. Remember, appropriate values for C1 and C2 depend on how much current you expect to draw from the supply (limited to Æ1 A using the regulators shown), and how much ripple voltage you can live with.
The circuit component values used and peak frequency parameters are Single-Coil: R ¼ 5 kO; L ¼ 2 H; C ¼ 100 pF fpk ¼ 9:2 kHz; Apk ¼ 27 dB Humbucker: R ¼ 15 kO; L ¼ 10 H; C ¼ 200 pF fpk ¼ 3:6 kHz; Apk ¼ 23 dB Low- and high-pass filters that exhibit peaking are said to be underdamped. Also, because these are second order LP filters the asymptotic response rolls off at À40 dB/decade once we pass the peak frequencies and enter the stopband. 3) The response curves of Fig. 7 are only valid for these pickups without volume or tone controls, and with no external cable.
13) The constant k is referred to as the perveance of the diode. Because the transconductance of the vacuum tube diode is described by a power function, the vacuum tube diode exhibits a much more gradual turn-on characteristic than the PN junction diode, which has exponential transconductance behavior. 1 Technically, the space charge region occupies the entire space between the cathode and the anode, but unless a forward bias is applied to the tube, virtually all of the electrons remain very close to the cathode surface.
Handbook for Radiological Monitors by Department of Defense
by James
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