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Tube headphone amplifier
Finished a nice DIY kit. This time a tube headphone amplifier.The two 6J5 triodes look fine ! Headphone amplifier with two 6J5 triodesAfter the triodes, low noise ic's...
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73 from Jakarta
Tata YB0EIN from Jakarta, Indonesia sent me this eQSL from an RTTY QSO back in 2006:
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Radio Veronica
Radio Veronica was an offshore radio station that began broadcasting in 1960. The station transmitted from the North Sea for over fourteen years. It was set up by independent radio, TV and household...
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QRP labs 5W CW transceiver kit
Hans Summers, G0UPL, has developped a new transceiver:It is a mono-band 5W CW transceiver, with tons of features, including WSPR beacon, built-in alignment/test equipment, iambic keyer, CW decoder,...
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Twin diode receiver
This radio uses two receiver chains; the supply voltage needed for the transistor amplifier is generated by a strong local broadcast station to which diode receiver number 1 (left side of the...
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KiCad
Today I downloaded KiCad version 4.0.7 which is an open source Electronics Design program. With the schematic editor you can create your design without limit; there are no paywalls to unlock features....
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Satellite TV
Today I kept track of the signal strength of the satellite TV signal from the satellite Astra 23.5 (Astra 3B transmits just above 11 GHz).It was interesting to see that a dip in the signal strength...
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Medium Wave receiver
This is how a Japanese design of a Medium Wave receiver looks like:And this is how it looks like as a $5 DIY...
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73 from Banja Luka
A nice eQSL-card was found in the eqsl.cc postbox today.An SSB 6m QSO made August 2008 was confirmed by Vlado from Bosnia Herzegovina:
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uBITX kit available
A DIY kit for the HF general coverage transceiver uBITX is available:http://www.hfsignals.com/
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Teylers museum
Some collections are special and deserve to be maintained. The collection of Mr. Teyler from Haarlem is such a special collection. This week we visited the Teylers museum and were able to see...
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LM3886 for lower bands
DIY audio fanatics appreciate this ‘chipamp’ a lot. See for example https://audio-creative.nl/audio-creative/diy-lm3886-chipamp/ LM3886 as 65 Watt audio amplifierIt...
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Discone antenna
Discone antennes cover a wide frequency range. MFJ has introduced a new discone antenna: the MFJ-1868.It is designed to receive radio signals from 25 - 1300 MHz and to transmit from 50 - 1300 MHz (up...
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TV test pattern
Just a nice picture of a TV test pattern from 1956. The era when black/white TV's conquered our continent:
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Digital Voltmeter
Geekcreit produces mini digital voltmeters for general purposes. Because the price of such a voltmeter is low (less than 2 euros) you can incorporate the voltmeter into each of your do-it-yourself...
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Home-built TV sets
Around 1948 employees of Philips could buy DIY kits to assemble TV receivers. Two pictures of home-built TV receivers from private collections:
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Radio scale
In the days digital frequency readouts were not available, radio tuning was done while looking at the scale. Names of radio stations were present on the scale;A nice example is the scale of a...
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Le Forty
A couple of years ago I have built Le Forty; a 40m QRP transceiver.I received a nice picture from Carlos EA1CGK in Salamanta from his version of Le Forty ('Building in progress').See also...
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Ouddorp antennapark
After a visit to the beach of Ouddorp I drove past a field with lots of antennas. It turned out to be a site of the Royal Dutch Navy with shortwave antennas. On shortwave the Navy communicates (encoded...
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