Provides 5v Gate Bias from –48v - 09/19/02 EDN Design
Idea A small and simple circuit derives 5V from the -48V rail that telecomm applications typically use (Figure
1). Useful for gate bias and other purposes, the 5V supply delivers as much as 5-mA output current. A shunt
reference. . . [by William Hadden]
Pulsing Charge Pump
Drives Capacitive Loads - 11/05/98 EDN Design Idea
(Several circuits here, scroll to find this one)The test circuit in Figure 1efficiently drives various capacitive
loads, such as memory cells and simple capacitors, so that you can observe their leakage effects. Essentially, .
. . [by Paul J Rose, Mental Automation Inc, Bellevue, WA]
Simple circuit provides 5V gate bias from –48V - 09/19/02
EDN Design Idea A small and simple circuit derives 5V from the -48V rail that telecomm applications typically
use (Figure 1). Useful for gate bias and other purposes, the 5V supply delivers as much as 5-mA output current. A
shunt reference, IC1, de. . . [by Will Hadden, Maxim Integrated Products, Sunnyvale, CA]
Solar Charge Controller - The previous version of this device used pulse width modulation (pwm) to control the power
from the five solar panels to charge the battery bank. Under full sun conditions the MOSFETS got a bit warm and
the whole unit radiated a lot of RFI. This design uses a set of relays - one for each panel. If the controller
decides the battery voltage is too low, it engages another relay; if its too high, it drops one out. This tends
to 'float' the voltage at about 14 volts as long as sufficient sunlight is available. . . . [by Luhan Monat-Mesa
Arizona]
Square Wave Driver Has
Flexible Outputs - This circuit can produce an output
signal ranging from DC to 100KHz. It can source a voltage ranging from 1v to 30v. It can sink a voltage ranging
from zero volts to –30v. It can drive up to 200ma of current and can even be switched to a floating tristate . .
. [Circuit by Dave Johnson P.E., 07/08/00]
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