Electrical engineer and brain scientist. Interested in making devices for ham radio, disabilities and scientific research.
This user joined on 07/25/2019.
This circuit was used to run a 2-tube super-regen FM radio from two 1.5 volt batteries.
Prior to WWII FM radios were on a 45 Mc band. After WWII the FM radio band was moved to the present-day 88-108 MHz. The converter allows you to listen to modern FM radio on a pre-war set.
Video jukebox player for persons with disabilities (motor or cognitive). Operates from one adaptive switch, wired or wireless. Intuitive: requires no training. Built as a turn-key Raspberry Pi. Videos stored on thumb drives.
Compact vibration detector. Auto-zeros in any position. Sets gain to maximum, then provides a single analog output reflecting the magnitude of movement along the axis of movement. Runs on Arduino Trinket with a ADXL345 accelerometer.
5 W to 100 W HF amplifier. Published in QST.