2 Tube FM Receiver

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This is a 2 tube superregenerative FM receiver. It covers the FM broadcast band (88-108 MHz), and a portion of the commercial aviation band (108-136 MHz). The receiver was initially described in a magazine article to cover the aviation band, but I modified it to receive the FM broadcast band as well. The front-end uses an RF (radio frequency) amplifier to improve sensitivity and isolate the detector from the antenna. The detector is followed by 2 AF (audio frequency) amplifiers capable of driving a speaker. Although simple, this receiver offers good performance and clear sound. It runs on 110 VAC.


Controls from right: Tuning, regeneration and volume. On-off switch and power-on light are on far left. The speaker grill was cut from a pre-punched sheet metal. The receiver can be monitored with low impedance headphones as well.


The removable telescopic antenna can be oriented for best reception. Transformer at right isolates the chassis from the mains. Speaker was mounted on the front panel with rubber grommets to minimize microphonics (feedback from speaker to components).


There was plenty of space for point-to-point wiring. The RF (radio frequency) amplifier and detector are on the right. The full wave rectifier is on the left. The audio transformer is above the blue capacitor. I received crystal clear music and couldn't stop myself from dancing the first time I powered the receiver!!!


A short history | My radio background | Homemade radios | Tube radios
Transistor radios | World band radios | Kit radios | Reel tape recorders
My other interests | Pictures of Lebanon | Radio links
Home | Showcase | About this site

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