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µTracer (uTracer), part 4: The built-in heater supply
Testing the onboard PWM regulator for tube heaters. Continue reading
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µTracer (uTracer), part 3: Making a custom USB interface
Designing and building a UART-to-USB plugin adapter for the µTracer board. Continue reading
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µTracer (uTracer), part 1: Selecting a vacuum tube tester
Some of the alternatives I considered before deciding to buy the µTracer. Continue reading
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Concept: Low loss polarity protection using a MOSFET
Many electronic circuits are likely to get destroyed if the DC source polarity is reversed. Whenever there’s a possibility that the user might reverse the polarity by accident, the circuit should have an onboard polarity protection. In it’s simplest form, polarity protection may be implemented using a single diode: The drawback of this method is Continue reading
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Project: My first tube amplifier, part 2: construction
Building a simple tube amplifier. Continue reading
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Project: My first tube amplifier, part 1: circuit design
Designing a simple tube amplifier. Continue reading
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Concept: Breadboard prototyping vacuum tube circuits
Faster and easier experimentation and prototyping with breadboard adapters. Continue reading
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An MW loop antenna made from scrap material (and some 3D-printed parts)
In the beginning, there were some teak mouldings from an old living room table, mahogany bars from a trashed radio console cabinet, some pieces of MDF and plywood, a tuning capacitor, a spool of enameled copper wire, and no prior knowledge of loop antennas; that is a good start 😄 I built a base of Continue reading
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Restoration: Tandberg Sølvsuper 2
This model was manufactured between 1938 and 1941. During WW2, when Norway was occupied by Germany, Norwegian citizens were prohibited from owning radios, and this recently acquired radio was confiscated by the occupants in 1941, and then locked away for years, until it was reunited with its rightful owner in 1945. Some earlier repairs/modifications indicate Continue reading
CATEGORIES
- Devices (58)
- Audio amplifiers (4)
- Broadcast receivers (13)
- Instruments (23)
- Microcontrollers (9)
- Power supplies (1)
- Storage (1)
- Televisions (1)
- Tools (11)
- Vacuum tubes (1)
- Horticulture (3)
- Processes (60)
- 3D printing (13)
- Concepts (4)
- DIY (48)
- Modification (5)
- Recycled parts (4)
- Repairs (3)
- Restoration (8)
- Woodworking (1)
ABOUT ME
Self-taught electronics hobbyist. Collector of Tandberg and other Norwegian broadcast receivers.
Retronics 