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.
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Inside the ASTRON 30
Big Linear Transformer
Picture of the bad regulator