Further to my first posting about DIY sensitive headphones. If you need a higher Z than the 600 ohms of the 'phones themselves, use a Bogen T-725 audio transformer with them to get a Z as high as 40K
Slightly OT but people like Mal and Jim may have an answer. Is there a "modern" (i.e. can you buy it new today?) headphone set that is extremely sensitive in the same way that the old DLR5 headsets w
Pat in those days they were refered to a Crystal triodes! 73 es GL Pete M0FMT IO91UX From: pat <[email protected]> To: [email protected] Sent: Saturday, 28 January 2012, 13:26 Subject: LF: OT:
Reminds me that I was once (during a Test Match series) very popular at school for having a home-brew 3-transistor MW/LW radio built into a Woolworth's plastic sandwich box. Reason for choice of box?
My other hobby is building "high-tech" crystal radios. I needed a really sensitive set of headphones but didn't have the cash to lay out for a pair, so in true ham tradition, I made a pair to suit my
LFers, Here is a site with some useful information on how to test and compare sensitivity of headphones: http://www.bentongue.com/xtalset/3cmp_hph/3cmp_hph.html 73, J.B., VE3EAR LowFER Beacon "EAR" 1
