[ARC5] Crystal Headphones

[Richard Knoppow]

    Interesting, I had not known this. Glad your surgery worked 
out. Please write me privately because I am very interested in this.

On 9/25/2018 3:30 PM, Fuqua, Bill L wrote:
> Early  crystal sets did not require a resistor across the crystal 
> earphones because the diodes were very leaky and allowed a path 
> for the earphone capacitance to discharge on negative cycles, 
> otherwise the earphone would charge up to the highest peak 
> voltage and after that you would not hear anything,
> 
>    The rocket radios had the resistor soldered directly to the 
> earphone, under the shield that covered the terminals and also 
> acted as a strain relief for wire.
> 
>     I am back, sort of, from my surgery and still recovering so I 
> have a lot of email to catch up on since last Thursday.  It feels 
> great to be able to walk again.
> 
> 
> 73
> 
> Bill wa4lav