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Results tagged with electronics
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user 13598
Questions which involve the properties or applications of individual electronic components.
2
votes
4
answers
1k
views
How to reduce voltage ripple of a linear power supply?
I made a simple linear power supply for my transceiver using 12V 30A transformer, four diodes RHRP3060 forming a rectifier and three 30_000 µF capacitors connected in parallel. I also used a 200 Ω 50W …
5
votes
0
answers
1k
views
What is an expected IF level of SA612?
I tried to use SA612 as a frequency mixer. Since it's a Gilbert cell, it has a high input impedance. Thus I added a pair of transformers as "Experimental Methods in RF Design" book suggests:
The mixe …
6
votes
1
answer
467
views
How to estimate input and output impedance of an amplifier?
I'm trying to figure out how to design power amplifiers which input and output are properly matched to 50 Ohm. My thinking was that the most bullet proofed approach would be to model an amplifier in L …
7
votes
1
answer
5k
views
How to determine number of turns for a 1:1 balun?
I would like to make a 1:1 balun with М1000НМ ferrite core (magnetic permeability - 1000) and 1 mm thick copper wire using triple bifilar winding. Unfortunately I didn't manage to find a clear instruc …
3
votes
3
answers
301
views
What causes an AF amplifier to make popping sounds in a superheterodyne receiver?
Recently I've made a simple single IF superheterodyne SSB receiver for 40 meter band. The schematic is available here [PDF]. VFO and BFO are based on Si5351, the AF amplifier is LM386. It works OK but …
4
votes
1
answer
1k
views
Looking for origins of a crystal filter schematic used in uBITX
Here is a crystal filter used in uBITX transceiver:
I've never seen such a topology in any other transceiver and decided to invest some time in exploring it. Turned out it's quite interesting. Eight …
1
vote
2
answers
651
views
What is a diode for in a JFET-based audio mute circuit?
I've build the following audio mute circuit:
It works fine. However in many circuits I've seen people add an extra diode on the gate of Q1:
For instance, see "QRP Classics" page 120 / page 159, or g …
8
votes
2
answers
509
views
How to reduce VFO sensitivity to the hand capacitance?
I got a little tired of Si5351 and decided to build an analog CW transceiver. It's almost done and works pretty well. However, I discovered one problem. When I reach the VFO control with my hand the f …
2
votes
1
answer
147
views
IF derived AGC: how to choose the best block diagram?
I've built several transceivers in the past. I never implemented IF derived AGC, so I decided to give it a try in the next project.
I choose to build a superheterodyne receiver, which will probably be …