Questions tagged [tuning]
The tuning tag has no summary.
41 questions
0
votes
1
answer
45
views
AN6305 “resistor bridge” connection—are both pads GND-to-GND (parallel to ground) for antenna tuning?
I’m following the ST application note AN6305, which recommends adding a “resistor bridge” [Page No-17, Fig-21] (a tuning component network) to allow fine antenna matching. The document shows this ...
- 4,323
2
votes
3
answers
200
views
How are the shunt coupling capacitors chosen in this double-tuned HF bandpass filter, and how do they affect the resonance and bandwidth?
I am studying a tunable double-tuned band-pass filter used as an HF preselector. A reference implementation is here: http://www.qrp.gr/hf_allband_filter.htm
The topology is:
Two LC resonators (left ...
- 45
1
vote
3
answers
125
views
Struggling to Tune My Multi Band Band-Pass Filter
I need to build a tunable band-pass filter for the 1–50 MHz range. However, I’m having trouble with the tuning part because the tuning range of the varicaps available on the market is very limited, ...
- 45
2
votes
1
answer
101
views
Why am I unable to obtain any output in my LTspice Bode plot simulation?
I am complete beginner in SPICE simulation and electronic engineering as such. I was trying to simulate a tuning circuit to compare it with experimental results (The device is a black box, I am trying ...
- 21
2
votes
1
answer
85
views
Where is the frequency tuning filter in this Op amp square and triangle generator?
I build this from a tutorial video and it output both the triangle and the square at 1091 Hz.
Since both wave form are in-phase and sync I guess the frequency selection must happen around the the ...
- 163
1
vote
0
answers
69
views
Tuning diodes and intermodulation distortion
How well do modern tuning diodes function in contexts where low intermodulation distortion is critical, e.g., in a high-gain preselector that might be exposed to powerful nearby out-of-band signals? ...
- 1,468
8
votes
2
answers
614
views
Battery supply and tuning of a Bulova Accutron watch
My grandfather died 3 years ago and left me a Bulova Accutron watch. This watch was a milestone in electronic watch design before the quartz type watches entered the market. The watch is based on a ...
- 12k
0
votes
0
answers
66
views
How to choose resistor capacitor values for specific frequencies
I have an array of 6 40106 square oscillators and I would like to know if there is any formula that in a given desired output frequency it will tell me which resistor and capacitor I should use?.
List ...
0
votes
1
answer
115
views
Tuned RF circuit: How to minimise interference?
The circuit in Figure 1 is designed to detect an RF signal at f0=40kHz. For information, this will be a portable proximity sensor, worn on a cat's collar, so it has be small and light.
The circuit ...
- 129
0
votes
3
answers
142
views
If many radio waves can generate currents in the antenna ground circuit **simultaneously** I am wondering do they all get carried over to the tuner?
If many radio waves can generate currents in the antenna ground circuit simultaneously, I am wondering do they all get carried over to the tuner circuit?, but only the current whose frequency matches ...
- 389
0
votes
0
answers
125
views
Ziegler–Nichols method of PID auto tuning
I am working on a problem where I need to implement auto tuning PID control using Ziegler–Nichols method. Basically I want to control temperature using it.
The PID has to be implemented with the ...
- 25
0
votes
1
answer
281
views
Why do PCB designers opt for serpentine tuning and switchback tuning over spiral patterns when addressing length matching in their designs?
I am currently researching the length matching problem in the PCB EDA domain and am curious as to why tools such as Allegro and Altium primarily use accordion, trombone, and sawtooth patterns to ...
0
votes
1
answer
538
views
Can I connect two PWM DC motor controllers in series to achieve coarse and fine tuning?
Can I connect two PWM DC motor controllers in series to achieve coarse and fine tuning? I would set the (2nd) fine tuning controller to midrange and then adjust the (1st) coarse one first.
...
- 1
0
votes
1
answer
231
views
Is there a way to "indirectly" measure the position of a variable capacitor?
I am modifying the insides of a vintage radio. I wish to avoid damaging it or changing it as much as practical.
Here is the insides of the radio in question:
A primary goal is to measure the position ...
- 217
1
vote
2
answers
168
views
Gating MOSFET with an antenna (adjust voltage to use only peak)
If we pulse a coil/tank circuit it's supposed to ring at it's natural frequency.
We could use a pickup coil over a shared ferrite core or a straight antenna, connected to the gate of a MOSFET to time ...
- 135