In article <U363g.27$qe.4171@xxxxxxxxxxxxxxx>,
Lab Rat <labratinaz@xxxxxxxxx> wrote:
I live in Arizona, USA. Can I use a generic AC adapter to connect my
Psion 5mx??
I suggest using a regulated DC power supply, rather than the more common
unregulated adaptors. (Radio Shack or similar could probably supply
one). If I recall rightly the Psion 5mx needs 6 volts. Make sure the
polarity is correct. The DC connector is a little unusual, so take your
Psion with you when shopping.
Several years ago, before regulated supplies were as common, I just used
a standard plugpack good for about 9 volts, and stuck a 7505 regulator
on the end of the cord. Had a couple of diodes in the common lead to
bring the output up to 6 volts. The entire thing including smoothing
capacitor just fitted into a fluorescent starter. If you have friends
into electronic hobby work it is a pretty easy thing to build.
Re: linear PSs ...>bridge rectifier across the 40 volts. ... which will be your common or ground. ... > This should give you about positive and negative 28 volts,... for a symmetrical negative regulator.... (sci.electronics.basics)
Re: Need a simple improved voltage regulator ... I've seen some with a transistor supposed to shunt noise to ground, but seems more like a phase inverter, depending on accurate resistors to match the emitter resistance.... Only when the voltage there is greater than the voltage in the filter caps will any current flow at all, and when it does flow, the capacitor looks like a short circuit and the current can be very high. ... The voltage drops from those high currents, if not isolated, can couple directly into the output of the regulator -- and even a perfect regulator would not help because the hum has cleverly bypassed it entirely. ... From the transformer to the diodes; from the diodes to the terminals of the filter capacitor; from the capacitor terminals to the input and common of the regulator. ... (rec.audio.tech)
Re: Need a simple improved voltage regulator ... caps will any current flow at all, and when it does flow, the capacitor... into the output of the regulator -- and even a perfect regulator would ... the resistance of even a short wire can be sufficient to ...common of the regulator. ... (rec.audio.tech)
Re: Gorgar pinball has to warm up before it will start... ... Most common part to ... replace on this unit is the filter capacitor for the 5vdc regulator... on the board (most boards in these old games need to have all of these ...Action Pinball & Amusement, LLC ... (rec.games.pinball)
Re: Basic Voltage Regulator Help ... When applying such regulators, it is common to include a .1uF or larger capacitor between input and common, to help stabilize the regulator, since wiring inductance in the raw supply lead can destabilize the regulator, and to also add a .1 uF or more between output and common to improve the high frequency noise rejection of the regulator, since its feedback voltage control has an upper frequency limit of less than 1 MHz. ... I have no idea what current your logic needs, but if the regulator gets warm enough to need a heat sink, you can also transfer some of that heat to a resistor in series with the input side (to waste some of the excess voltage, and also help filter noise spikes from the 12 volt supply with the help of that input capacitor), as long as there is at least 5.3 volts left at the input of the regulator. ... (sci.electronics.design)
