10-24-2015, 03:37 PM
What you have is a variocoupler. It can be used in any of several ways in a regenerative receiver. Here is a simple circuit for the first stage of the 2 tube radio you propose, the second would be a simple amplifier following an interstage audio transformer which would go where the headphones are shown.
[Image: http://40.media.tumblr.com/66fdd422f88a3...1_1280.jpg]
The two variable condensers are optional in the circuit and provide better, sharper tuning. The condenser across the phones is optional also. I hope this helps.
[Image: http://40.media.tumblr.com/66fdd422f88a3...1_1280.jpg]
The two variable condensers are optional in the circuit and provide better, sharper tuning. The condenser across the phones is optional also. I hope this helps.
