Well done Hans, Shipping time was 7 weeks, now one week. Forwarding cost was $60/ for two amps, now $0. Now I can afford to buy more TOYS from you, and keep on irritating you. All Best, George K3GK

Hello-- /speculation mode on/ If would be interesting to de-encapsulate some of the failed IRF 510s and analyze what damage occurred to the die (or dice). To paraphrase an old vaudeville routine,

Thanks Skip, I got your email and have some on the way now. -- 73, Greg KY4GW

Major comment for all amp builders regardless of design and designer. IF the DC power applied is high for the power out HEAT will be an issue. So measuring is required. generally for the 50W amp if

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Hi George No problem mine gets stuck too sometimes. Particularly on Fridays. No. It should be OK. No. But the device is being used within specification. I have no reason to suspect that there

Hans raises a good point here. I built an amp using an RD06HHF1 FET originally for 475Khz, and to the best of my knowledge I had done all the right things regarding output transformers and RF

Something along this line? https://smile.amazon.com/WGCD-SPDT-Momentary-Button-Switch/dp/B07D1HSN56

OK Hans. It goes south at 10 wpm normal CW. Sorry about the caps lock. I'll see what happens with your IRF 510 when the new amps come in. I'm building an amp for 40 and with your supplied IRF510.

Hi George Firstly, I think you may have an RF grounding or SWR problem, RF appears to be getting into your keyboard and causing the Shift key to be permanently operated, giving the effect as though

Nothing has time to get too hot. I am running the QCX on 12 V 7812 as suggested but it still is 4 watts out. Is overdriving a possibility?

Are the transistors getting hot? Are they the same temperature as the heatsink? Is the dummy load getting hot?

Howdy all, I'm building my second clock kit (with GPS) and mounting it in a custom box. I need to mount the buttons remotely so I don't have to open the box any time I want to make an adjustment. I'm

Dave, I tried to switch it with practice mode on and off. No difference. I think the issue is way before the output areas. My voltages are off all over the board, as noted above. I can't even trust

THIS IS THE SECOND SET. YOUR TECHNIQUE WAS AMAZING. ALL REPLACED IN TEN MINUTES. BUT UNFORTUNATELY EXACTLY SAME RESULT.

QRP LAB DUMMY LOAD. 18.8 VOLTS. 2.66 AMPS. DECLINES STARTS IN 3 SECONDS KEY DOWN AND THEN IS RAPID.

Hi Daniel Thanks, yes, it is going very well... around 60-70% of customers are choosing the FedEx option, and are consistently reporting the 3-4 days shipment time stated by FedEx/TNT. 73 Hans

My parcel was shipped on March 2 and arrived me on March 6 with FedEx Express. Incredibly fast. Daniel Ungureanu 73 Y08SAK

Thanks Hans, am thinking an idea for my ARC. Will Mi0wwb

Hi Will See http://qrp-labs.com/flights/u4b2 This is the 2nd test flight for the QRP Labs U4B balloon tracker. It is not yet commercially available. The balloons are from China via AliExpress, they