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It is also poor lab practice to use precision calibration kit standards as adapters or dummy loads.? They are precision instruments and should be given requisite care. 10 watt 30dB attenuators are

Has anyone found a custom case for this buck/boost converter please? (Or models with the same

Richard, I'm glad you found the BS170 problem.? They probably sent you the wrong type of transistor, since all BS170s in those type of packages have the same pinout. I think the peak-to-peak voltage

Nothing beats TWO irons, one in each hand, for removing such components.? Touch each end and lift it off. I have been evaluating two of the Pinecil irons (with the shorter tips) and am pretty

Thanks for the correction, Jerry.? I mis-spoke regarding the voltages at Q508, and it does appear to be operating correctly.

ON a hunch, I ordered a new batch of BS170s from a different supplier.? It looks like I got a bad batch for my last replacements.? Testing a couple of the ones I hadn't used, it looks like the

Debugging can indeed be discouraging, but please don't give up.? We'll continue to help. If you limit your current to 250-300mA, it can't burn up the BS170s - it also won't give full power out, but

Lifting one end is a good way to lift the opposite pad. I would suggest making a tool consisting of a "U" shape of heavy-ish solid wire whose legs would closely straddle the diode contacts, tinned at

Jamie, hope all is well following your surgery!? In summary, I removed C17 and inserted a wire into the now empty PCB hole connected to R6.? That wire runs to the ring terminal of an 1/8" TRS jack

Jerry, Thanks.? I'll give it a try as soon as I can (probably over the weekend). 73, Mike, KL7MJ

I put you on the list... Note that if we do a group buy again, we will either do V2 or V1.2, but not both. Still evaluating V2 design performance... Stan KC7XE

No.? L102 and C106 filter the voltage, trying to average it, so it won't go down to zero. But this is BAD, and needs investigation before replacing D109. The processor produces PWM (the PWM_3V3

Hi Joel. I'm wiring up my Pacific Antenna mic now.? The manual says that the bare wire is ground, but there is no bare wire :-) Mr. Ohm Meter says: RED = TIP and I understand that TIP is PTT. WHITE

For a few seconds maybe. It is a small chip capacitor in a tiny metal case. Not designed to dissipate any power. Real Dummy Loads are easy to make. Twenty 1k quarter watt resistors in parallel make

I have successfully removed D109 on QMX+ using this technique.? I first used some 60/40 solder on both ends of the diode, with a hot iron, to melt the lead-free surface-mount solder, and mix it with

I noticed the same issue, but raising the VOX Threshold to about 35 or higher completely resolved the issue, and it was still plenty sensitive for my voice (though this probably depends on the

Maybe you could buy a pack of 10 units from QRP-Labs shop, you would be sure to get the good devices. 73 - Pierre - FK8IH

It's actually L515 and L516 (20/17/15) that have a number of turns lower than their 'design' inductance. L517 and L518 are right on target. You can see this by using toroid.info to calculate the

I had to replace a failed IC403, so that is a possibility.? In my case it was caused by a probe-slip while I was measuring something, which caused an over-voltage on Vcc.??? Kai, if you think

Glad to find some traffic on this topic. I am surprised these coils have similar number of turns to the 20/17/15 meter LPF. and likely wrong inductance. but a few thousand rigs before me, I will