We were contacted by a local HAM radio operator that is blind about a power supply that runs his HF radio.
The power supply was a ASTRON 30 and did not function. The students were excited about taking on this job, we troubleshot the problem down to a faulty regulator and bad crowbar circuit protection. The student got to learn about transistor Voltage Regulator and Silicon Controlled Rectifier used a a over voltage crowbar protection circuit.
For more information about Handihams please visit the link below:
http://www.arrl.org/enabling-ham-radio-s-disabled
Inside the ASTRON 30
Big Linear Transformer
Picture of the bad regulator
