Graymark radio kits to build
- Graymark radio kits to build manual#
- Graymark radio kits to build full#
- Graymark radio kits to build plus#
Graymark radio kits to build full#
Parts shipped with our full kit support reception of the standard AM band. The 4.0 by 2.5 inch PCB houses all of the electronics for the receiver except for external tuning coil, air-variable tuning capacitor, panel and chassis. The MK484 IC features stable operation and low current drain, while providing a complete RF amplifier chain, AM detection and AGC circuitry. Coupled with an external antenna, FT82-61 ferrite toroid (for tuning coil) and air-variable capacitor, the MK484 AM Radio Kit gets surprising results. The heart of the kit features the ubiquitous MK484 IC in a TO-92 transistor package coupled with our old friend, the 386-4 audio amp in an 8-pin DIP. Increasing/decreasing the turns on the ferrite coil shifts reception down to a minimum of 180 kHz/maximum of 3,000 kHz, supported by the MK484. The parts and instructions supplied with the full kit support reception of the broadcast band, roughly 550 to 1500 kHz. This kit provides you with a great place to start for exploring and building kits for reception of AM broadcasts. The spider web coil form is fully drilled and slotted as indicated in the picture. Two larger holes for the variable caps are punched for you ahead of time. Two mechanical drawings - to scale - are also provides as templates for the holes you will drill in the ABS chassis and front panel, requiring 5/32 and 1/4 bits you'll supply.
Graymark radio kits to build manual#
The kit manual is 12 pages in length and includes information on winding spider web coils. You can purchase 150/46 Litz wire if you like, which we stock on our parts page and will boost the coil Q a bit. The set comes with 60 feet of #22 enamel wire for the spider coil. The set expects to see a 40 to 50 foot end fed wire antenna and earth ground. Parts are selected to cover the AM broadcast band. The set produces good volume and low distortion audio compared with most crystal sets. This kit features a spider web coil, infinite impedance detector on a 1.5 by 2 inch PCB, two variable capacitors - one for station tuning and one for antenna tuning - and ABS low-loss coil form, chassis, and front panel. It has pictures and symbols for basic parts and gives the reader basic information to get started with that first building project. This small booklet is written in easy to read language for the true beginner to our wonderful hobby.
K Fenton has written "Building Your First Crystal Radio," See picture and to order below. You'll need to buy and eat the oatmeal.Īttention beginners and mentors. The extra wire can be used to make a bigger coil, to cover more of the broadcast band, or it can be used as antenna wire.
Graymark radio kits to build plus#
This pack includes everything in Pack 1, above, plus another spool of 24 gauge hook-up wire (100feet). If you need an antenna, then order the Oatbox Pack 2. The plans for this radio are on our website at Great for classes, scouting, and science fairs - easy for kids to put together, with adult supervision. The pack includes 1 Spool (100 feet) #24 wire, 1 IN34 Diode, 1 100 pf Capacitor, 1 47K Resistor, 3 alligator clips, 1 ceramic, hi impedance ear piece, 56-32 by ½ machine screws, 10 6-32 nuts, 5 #6 solder lugs - you provide the box (eat the oatmeal, it's good for you!) and an antenna. Build an inexpensive radio out of an oat meal box.