[sdiy] LC osc for AF

[Scott Gravenhorst]

As a kid I remember making Hartley oscillators for both audio
and RF, with both tubes and transistors.  There is also a
Colpitts circuit for tapless coils.  For audio you need large
value inductors and caps.  I used speaker transformers from
salvaged radios and TVs to make audio Hartleys.

Toby Paddock <tpaddock at seanet.com> wrote:
>Could someone point me to some 
>Audio Frequency LC Oscillators for Dummies info?
>
>I'd like to build some, but it's been too long 
>since I did that in school and that was probibly 
>RF and with tubes and I didn't really pay enough 
>attention anyway and my books are buried in the 
>garage somewhere.
>
>The coils are on a rod core and maybe something 
>like 10-100mH.  50mH and 2uF would res at about 
>500Hz, but I don't even know if that's a 
>reasonable range.
>
>Interaction between oscillators with the coils 
>near each other is a definite plus.
>
>Don't care about a clean waveform. 
>Don't care if it's stable.
>
>Thanks,
>Toby Paddock
>
>PS- Unrelated, but does anyone use inductor 
>saturation or hysteresis for distortion?
>
>

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