Resonance Circuits and Resonance Systems

[synchro1]

Lester Hendershot's schematics:

[Bob Smith]

Here's a very simple home made variable cap, used for a crystal radio project:
Bob




https://youtu.be/iunAvz9PbN0?t=86[/font][/size]

[synchro1]

Bell ringing circuit:

[tinman]

Here's a very simple home made variable cap, used for a crystal radio project:
Bob




https://youtu.be/iunAvz9PbN0?t=86[/font][/size]

Hi Bob
Thanks for the link.
I hoping to make one with a far greater variable capacitance,along with being much more compact.
I do have an idea,but it will be tricky to put together .


Brad

[AlienGrey]

Hi Bob
Thanks for the link.
I hoping to make one with a far greater variable capacitance,along with being much more compact.
I do have an idea,but it will be tricky to put together .


Brad

yes very nice . (Bring back Jackson brothers), but don't JCar or Maplin do a substitution box ?   

Have a look at this device, https://uk.search.yahoo.com/yhs/search?ei=UTF-8&type=avastbcl&hspart=avast&hsimp=yhs-001&p=capacitor+switch+box