Various Power Supply Circuits
This page is somewhat incomplete but does provide a couple of Schematics of
PS's that I have been using for quite a number of years for one purpose or
another.
The DC to DC power supplies offer an excellent supply of 24 to 30VDC either
Positive or Negative outputs from a single + 13.8 VDC (typical Ham shack
PS). The simplicity and cost is far better than purchasing Transformers
and associated components to construct your typical Linear 24VDC PS.
A couple of the images show the PS's that I am using except the heat
sink is a simple piece of flat Aluminum 1/4" thick & 3" in length
secured to the chassis wall of what ever I may be using it in. Not those shown.
I use the Positive version to power, or drive the many 24VDC relays I have in
operation. The Negative PS is an excellent PS for the very common Microwave
Bricks that use either a -19, or -20VDC input. Although this has NOT been a
problem, you might consider placing an RMI shielding cover over the supply
module. I have not done this and have noticed no birdies or interference of any
kind.
Another application is Portable, and /or, Mobile use where something higher
than 13 or 14VDC is required in either one, or both polarities.
A MUST DO: Make certain all relays have a reverse biased diode
& 0.1uF Cap. across the coil to prevent back EMF from entering the
regulators. A practice I usually make is to also place a forward
biased diode in series with the line out from the regulators, perhaps a bit of
over kill, but piece of mind is worth it.
Another note: remember to provide electrical isolation between active
device and heat sink using adequate thermal compound.
Schematic of Positive version. |
Rather crude but very functional circuit for + version. |
Another view of + version. NO heat sink installed. |
Another view. |
Schematic of Negative version |
Another crude but functional version of the Neg. PS |
Side view of Neg. PS showing un-common heat sink. NOT
recommended for service installation. |
Case description and pin out function of LT-1071, &
LT-1070.
5 Amp & 2.5 Amp version respectively |
| Recommend downloading PDF Data Sheet from Linear Technology.
http://www.linear-tech.com/ |
Available form DigiKey, and others components suppliers.
http://www.digikey.com
|
|
|
|
Below is a Schematic for a Tetrode Screen & Grid Supply that has served
me & others very well for a number of years. The protection circuit
while relatively simple provides excellent protection form over currents, etc.
This will be re-drawn shortly
As usual if anyone wishes a paper copy of these schematics
please send me a SASE, or sufficient funds of cover mailing cost.
Home TOP, or Contact Me Here
New CPLD PLL's
VE1XYL when allowed ( ;o} 
This will be re-drawn shortly