These are Simple Crystal radio kits ( Xtal Radio Kits ) and are easy to build. These Crystal Radio Receivers tune the AM Radio Band.
Crystal Radio Kit 1 includes:
- 1 – 1N34A Germanium Diode (Crystal Diode Detector)
- 1 – 47K resistor
- 1 – .001 Capacitor
- 1 – 680uh Loopstick Antenna Coil with tap at 470uh
- 1 – Plastic Variable Capacitor 60pf /141pf
- 1 – Knob and Shaft
- 1 – Ceramic Earphone (Piezoelectric Earphone , Crystal Earphone)
This Kit has one Tap on the Crystal Radio Coil near ground for the Antenna Connection.
The Simple Crystal Radio Set Kits ( Xtal Radio Set Kits ) require some soldering of the fine wires from the Ferrite Loopstick Antenna Coil the the variable capacitor. So Adult Supervision is advised for younger builders.
Learning how to build a Crystal Radio Receiver is a great way for anyone to get started in the electronic field. Great for Science Fair Projects and Boy Scout projects. The Simple Crystal Diode Radio Sets we have for sale are a fun way for the family to spend time together. As a child I made Crystal Radio Receivers out of things I find in old scrapped Radios and TVs. Most had no tuning capacitors. I had to tune in stations by sliding a ferrite rod in and out of the tuning coil. I would spend days trying different items to use as a detector instead of a diode, some worked but most did not. Anyway I had fun learning. Buy one of our Crystal Radio Kits for hours of fun and learning.
Dave Farrell purchased this kit for his Elementary School Class on Crystal Radios. He says the kids loved it. Here is a Power Point Presentation on there project and how they assembled there Crystal Radio Kit. Also contains some theory on how a Crystal Radio works Building A Crystal Radio.
Above is a picture of the assembled Crystal Radio Kit number CRK1 we have for sale. This is just a simple way to mount the components I used a clear contact glue to glue the coil and Variable Capacitor in place I also put a little glue on the Ferrite Rod to keep it from falling out. I was able to solder the lower antenna tap to a fahnestock clip. You can use other means for an antenna connection. Instead of writing pages on how to build the Crystal Radio Kit I think if you are like me you assemble things from the pictures anyway before you read the directions. The thin wires from the coil are hard to see but look at the two prongs from the Variable Capacitor. The wires from the coil are fairly long so I bunched them up and placed them under the coil leaving enough wire so that if one broke I could re solder it.
All of the Crystal Radio Kits are the same except for the coil. Kit #1 has one tap on the bottom of the coil for connecting a antenna no need to wrap wire around the coil for a antenna connection. The other Simple Crystal Radio Kit #2 has a tap towards the bottom and a center tap. The bottom connection is for the antenna and the Center connection gives better selectivity at a slight loss in volume. The top connection gives most volume but selectivity is reduced a little. Crystal Radio Kit #3 has no taps on the coil.