Barbouri's Electronics Projects
Restoring vintage electronics along with designing and building new circuits. One eye looking into the past, the other looking into the future.
After the restoration of the Nakamichi 620 amplifier last year, it had been working great for 6 plus months. Then one day I turned it on and there was no sound output. Luckily the speaker protection circuit did it’s job and no speakers were damaged. The right channel had it’s output shorted to B+ (53 volts).
I was kindly donated a Nakamichi “System One” rack of audio equipment recently. Overall the equipment was in good shape, but had been in a building fire and suffered from significant smoke damage. There was not any detectable heat damage and only minor water damage.
After successfully repairing the 610 FM Tuner / Preamp I decide to tackle the model 620 audio power amplifier next.
I have had my Nakamichi 420 audio amplifier since the late 70’s, and have used it with no issues since it’s purchase. Recently I was listening to an album, when it quit producing any sound, and shortly after produced that burnt electronics smell we know so well.
A project to design and build a Low Noise Amplifier (LNA) and 1,090 MHz bandpass filter for receiving ADS‑B transmissions on a Software Defined Radio (SDR).
Continue reading “Low Noise Amplifier for SDR Radio ADS‑B Ver. 2.3 with 1090MHz ceramic filter”