Instruments
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DIY: Dummy load 2 x 100W with selectable 4, 8 or 16 Ω resistance
A simple yet versatile and fairly powerful dummy load for testing audio amplifiers. Continue reading
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DIY: AGC disabler for use when aligning vacuum tube radios
A battery powered, adjustable voltage source for locking broadcast receivers’ AGC lines at a certain DC voltage during alignment. Continue reading
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DIY: Digital EM84 “magic eye” replacement
My first attempt at making a digital replica of an indicator tube. Continue reading
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DIY high temperature programmable thermostat
A programmable thermostat/thermometer/thermofuse with K-type thermocouple sensor. Range from 0°C up to 1024°C (depending on sensor). Continue reading
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DIY RF Step Attenuator/Dummy Antenna
A cheap and simple RF attenuator, with 10dB steps from 0 to -40dB, and integrated dummy antenna, for use when aligning old AM radios. Continue reading
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Andonstar AD407 microscope add-ons, part 2: Base, PSU and LED dimmer
Extending the base platform. Making a custom PSU and LED dimmer. Continue reading
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Andonstar AD407 microscope add-ons, part 1: extender and LED ring
Some of the drawbacks of this microscope, and how to fix them. Continue reading
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DIY: Mini turntable strobe
A crystal controlled, USB powered strobe light for turntable speed adjustment, with selector for 50 or 60 Hz strobe discs. Continue reading
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µTracer (uTracer), part 10: Practical use + preliminary verdict
Video demonstration of tracing anode characteristics of an EL84 + some my thoughts about the µTracer so far. Continue reading
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µTracer (uTracer), part 8: Testing the DIY heater supply
Measuring the output voltage accuracy at different load currents. Checking whether the current limiter works as planned. Continue reading
CATEGORIES
- Devices (59)
- Audio amplifiers (4)
- Broadcast receivers (13)
- Instruments (24)
- Microcontrollers (9)
- Power supplies (1)
- Storage (1)
- Televisions (1)
- Tools (11)
- Vacuum tubes (1)
- Horticulture (3)
- Processes (61)
- 3D printing (13)
- Concepts (4)
- DIY (49)
- Modification (5)
- Recycled parts (5)
- Repairs (3)
- Restoration (8)
- Woodworking (1)
ABOUT ME
Self-taught electronics hobbyist. Collector of Tandberg and other Norwegian broadcast receivers.
Retronics 