sorry for bw..... finally found it.

Gwen, Anytime you control the amperage to a linear amplifier, such as with a current limiter, you make it non-linear. This will cause all kinds of inter-modulation products. It is similar to

This sure sounds like a good arrangement. tim ab0wr "Bill Cromwell" <wrcromwell@...> wrote:

Thanks, Iz. I will try to find a silent 3-5A power supply, or maybe I can buy a standalone AC noise filer. // hiro, JJ1FXF 2018/06/30 5:57、iz oos <and2oosiz2@...>のメール:

Bo, Heathkit was my great aspiration when I was a junior high school student, I remember. I feel the same heated atmosphere with uBITX this time. Thanks for your message, Bo. ARIGATO! // hiro,

As did I, David. Thanks for the reply. The popularity of the uBitX continues I see. Hal AC0AX

Understanding the circuit... Both the pre-driver and driver the pairs have their own (per transistor emitter resistors) and the idea is to have the device operating at a reasonable point that being

I've build SS amps for radios up to 350W and never had RF get into a power supply. I could understand if the antenna was poor and you had high shield currents but a dummy load? No. I'd suspect the

It's possible this might work on Linux with the Cheese application. I need to find out if this is so before I drop $200 for it though. Terry - KB8AMZ Brimfield Twp, OH USA EN91hd Linux User# 412308,

Tim no. The problem is if the first transistor Q71 is not biased to the half power supply point the output are both unbalanced and the bias is wrong. IF Q71 collector is not at about 6V (for 12V

Another that more closely resembles the V4 circuit with improvements. The two NPN can be 2n3904 and the pnp is 2n3906. I've used this flavor from 5V though 20V. At 12V it will put 250mW in to a 8ohm

Thanks, Allison...looks interesting. Jack, W8TEE

Thank you, Tim. That's certainly a better answer than assuming I want to overdrive it, or telling me what I already knew, that I needed to regulate it. I'll check RV1. I'm still a bit confused about

I tried a mod like this and the gain dropped so I split the feedback resistor by 2 and bypassed to ground with a 10uF at the center. Sounds great now.

Trying to make it simple. You regulate the voltage. Let the device draw how ever many amps it needs or wants. In the case of the ubitx it will be around 2 to 3 amps depending on the power it is

I had suggested regulating the voltage, but didn't consider that pot. I agree with the above.

LINK or https://www.banggood.com/9-24V-3A-72W-ACDC-Adapter-Switching-Power-Supply-Regulated-Power-Adapter-Supply-Display-p-1237159.html?rmmds=search&cur_warehouse=CN Cheers -- Raj, vu2zap Bengaluru,

Hi Allard Went to add a Tune button to my BitX40 Raduino but cannot get it to work. As suggested, added a push button in series with a 1K resistor between pin A1 on connector P1 to ground, as well as

Sorry Allard. Figured it out now. I did not have the BitX in CW mode via the Function push button. All works now! Cheers -- John VK6JAH

Looks good, but switch mode supplies can cause a lot of RF interference. Have you tried it? Cheers -- John VK6JAH