Heathkit Cr-1 Crystal Radio Manual

Many of the files here are just schematic diagrams but some include additional information such as specifications, and a few are complete manuals. 'Partial manuals'. Files in a 30 minute period. If you have anything to add please email paul (at) vintage-radio (dot) info. CR-1 Crystal Receiver Schematic only pdf file. Contoh Proposal Seminar Kewirausahaan Mahasiswa.

He would do some repair on TV and radio. He also owned and built Heathkit test equipment and then. The original assembly manual. Heathkit CR-1 Crystal Set. A Heathkit CR-1 crystal radio. Most crystal radios use only one half of a radio frequency's wave. The importance of a good antenna and ground system. Heathkit CR-1 Crystal Radio and Miller 595 Tuner Information. This page gives the circuit and pictoral description of the famous Heathkit CR-1 crystal.

Rebuilding my Heathkit CR1 and getting it to work I can not really remember when or how I came by this little radio, but it was many years ago. I seem to recall that I picked it up cheap at a thrift store as a non-functional item that had been poorly or incompletely put together.

I remember that some of the screws and a connection post was missing and the parts weren't soldered in properly or correctly. To tell the truth, I didn't know how the radio was supposed to be wired and I must not have been very interested in getting it working, so it sat in a cabinet for several years until a year or so ago. My CR-1 crystal radio modified for two earphone jacks. About a year ago I came across the little radio and decided that I would figure out how it was supposed to work and then I'd put it together correctly. The first thing I did was put a sub-miniature phone jack in place of the missing binder post since my piezo earphone has a sub-miniature plug on it and besides, I didn't have a matching binding post to replace the missing one. I took off the grounded binding post and put a screw to cover the hole.

Next I soldered the antenna tuner coil to its variable capacitor and wired the two fixed capacitors to the selector switch. I then soldered the station tuning coil side to its variable capacitor and from the tap on the station tuner coil, I soldered a 1N34 germanium detector diode to the phone jack. By the way, Heathkit called the tuning capacitor connected to the station tuning coil the 'detector tuner' and on the panel it is labeled as 'DET' for detector. Back side showing the radio's components.

The antenna and the station tuning coils are wound on the phenolic tube. The antenna coil is to the left of center. A powdered iron (ferrite) slug is inside the tube between the two coils. When I finished soldering everything in correctly, I connected the little set to my antenna & ground and soon I could clearly hear my local AM stations, but I noticed that the tuning dial seemed to be way off. At the very top of the AM dial (around 1600) I know there is a very strong Mexican station, but I couldn't go high enough to tune it in. To match the dial with the AM band, I took a thin wooden stick and gently pushed on the ferrite slug in the coil form until it was nearly centered between the two sets of coils. By moving the slug, I was able to match the dial to about where I knew my local stations were and was able to hear the Mexican station near the top of the dial.