I'm slowly assembling pieces for an 80m Weaver based transceiver. It's really hot now in the workshop with summer arriving so I retreat to the house after 9am. The receiver is taking shape so I'm turning my attention to the transmitter while in the house.
Reviewing the 1 Watt Class A buffer I have used in previous projects I found obsolescence had arrived. While I still had some of these transistors in the parts bin it felt appropriate to cast around to see what else was out there.
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| 1Watt HF Buffer - Class A |
While this amplifier has served me well I'm going to let myself be distracted and test how this amplifier chain works with transistors readily available today.
Q4 could be a SOT23 device. I've got plenty I can try and it's not worth agonising over. Q5 should be something more substantial to cope with the heat it will dissipate. Easily found I've ordered a couple of types of SOT89 transistors for Q5.
Q6 dissipates around 1.5W so I wanted something capable of handling at least 2W. I think I have found suitable transistors though the package of each is different.
Let the testing begin!
73's
Richard
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