Archive for December, 2016

Pastime Projects Tube Type “Companion” Power Supply Status Update

December 6, 2016

The new “Pastime Projects” Alham VT-1 Power Supply Kit is being prepared for shipment.
It includes a tube type rectifier as was used back in the late 1940’s and 1950’s. It
has an output of about 200 DC Volts – same as the current power supply which uses modern
solid state diodes for the rectifiers.
It’s design is simplified and uses a capacitor input style filtering circuit. The
circuit is similar in design to similar power supplies of the 1940-1950 era. There is
no filter choke in the circuit. In tests, we see no degradation in performance, but see
an advantage is less weight to ship, and less cost.
The kit includes a Cinch-Jones style plug and matching socket to connect the power
supply to your transmitter. These add a sizeable cost to the kit, but it’s well worth the
convenience.
The circuit uses a fuse in the line cord circuit, and red and green neon lights to
indicate when power and high voltage are on. The high voltage lamp dims slowly as the
high voltage drains through the bleeder resistor built into the circuit.
While no decision has been made, Pastime Projects may discontinue the original
solid state supply as acceptance of the new power supply builds.
We will accept payment of the VT-1 power supply kits early, or, just email us for
notification of the release. Watch http://www.pastimeprojects.com for more news. 73 Glenn for
Pastime Projects.

Pastime Projects Regenerative Receiver Kit Redesign Coming

December 2, 2016

7.28.09 prod

The regenerative receiver kit is returning to the http://www.pastimeprojects.com catalogue of radio enthusiasts kits.
The design was redeveloped around the 40 meter ham band range. It receives AM foreign broadcast, cw, single side band with patience, and radio amateur AM stations. It is not recommended for use as a main receiver for radio amateur stations. Regen receivers tend to require careful tuning. They show more drift than commercial receivers.
But they are fun for beginners, short wave listeners, and experimenters. Our design now has been tested on the
3.5 MHz range, and 80 meter ham bands are being heard. The kit includes some unusual features. One is the use of
a “space charge” type tube that uses 12 volts on the plate as well as the filament. That means this receiver will be powered by your 12 volt DC power supply. The kit is somewhat difficult, but assembly, wiring,, and testing are explained in detail in the step by step manual that is included in the kit. Stay tuned for more! 73 Glenn for Pastime Projects (at) yahoo (dot) com.