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- Tue Apr 23, 2024 4:15 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
po
- Wed Apr 17, 2024 2:47 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
- Sun Apr 07, 2024 3:28 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
jgh
- Sun Apr 07, 2024 3:13 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe picsjgh
gjh
- Sun Mar 31, 2024 3:08 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
- Wed Mar 06, 2024 1:28 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
hg
- Mon Mar 04, 2024 6:05 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
lkj;
- Fri Mar 01, 2024 2:28 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
jfgb
- Tue Jan 02, 2024 1:00 pm
- Forum: Attenuators
- Topic: Bias output stage via AVC
- Replies: 1
- Views: 1593
Re: Bias output stage via AVC
Hey, Your circuit will work fine as drawn and the DC offset is not a problem since as you mentioned, the current will be in the µA range. However introducing a switch to change levels to a situation with DC offset and an inductor (AVC) will open up the possibility of some audible transient "pop...
- Tue Jan 02, 2024 12:53 pm
- Forum: Attenuators
- Topic: How have the auoformers changed over the years
- Replies: 4
- Views: 5162
Re: How have the auoformers changed over the years
the 200Hy number is measured at 100Hz and will be the same at 20Hz.
dave
dave
- Fri Dec 08, 2023 11:01 pm
- Forum: Inductors
- Topic: Series connection of inductors to cut down capacitance
- Replies: 1
- Views: 3111
Re: Series connection of inductors to cut down capacitance
in theory the capacitance of two identical discrete chokes connected in series should be half of a single choke which should net you an extra octave of top end. In practice I have come close to but never realized that behavior, primarily because the core if grounded to stop stray pickup prevents the...
- Tue Nov 07, 2023 3:51 am
- Forum: Attenuators
- Topic: How have the auoformers changed over the years
- Replies: 4
- Views: 5162
Re: How have the auoformers changed over the years
no changes... Inductance is in the 200Hy range.
dave
dave
- Sun Oct 22, 2023 7:12 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
sd
- Sat Oct 21, 2023 9:03 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
jk
- Fri Oct 13, 2023 9:26 pm
- Forum: Phono
- Topic: Loading and Frequency Response
- Replies: 0
- Views: 7880
Loading and Frequency Response
I was asked about how the load seen by the cartridge effects the frequency response so I made some quick crude measurements of a shelter 501 and a denon 103R. The test record was the CBS STR-120. The sound card was a Focusrite Scarlett 2i2. captures were made with audiotester. The tonearm cable fed ...
- Sun Oct 08, 2023 11:17 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
nn
- Wed Sep 06, 2023 11:42 am
- Forum: Phono
- Topic: Step-up after LCR
- Replies: 92
- Views: 311127
Re: Step-up after LCR
Hey Daniel, The first thing that comes to mind is if the iRiaa filter you are using has the 50kHz time constant. Here is a LCR filter with the 50kHz Neuman time constant into a LCR filter with and without it. Screenshot 2023-09-06 at 7.27.40 AM.png I suspect if you add the resistor R6 you might be a...
- Sun Sep 03, 2023 12:41 pm
- Forum: Phono
- Topic: Step-up after LCR
- Replies: 92
- Views: 311127
Re: Step-up after LCR
V1 / V2 are voltage sources and serve as an easy way to set the tube bias. I have used LED's in this position and they work well. I simply put the expected voltage drop of the LED as a voltage source under the cathode rather than trying to find or model the exact LED I use.
dave
dave
- Thu Aug 03, 2023 12:11 am
- Forum: Phono
- Topic: LCR parasitics
- Replies: 2
- Views: 3082
Re: LCR parasitics
no... I typically build the circuit, measure and then adjust the parasitics until spice matches the measured response.
dave
dave
- Sat Jun 03, 2023 1:35 pm
- Forum: Playing With Airgaps
- Topic: Magnetized AVC?
- Replies: 11
- Views: 44075
Re: Magnetized AVC?
those numbers all look good.
- Sat Apr 29, 2023 2:14 pm
- Forum: Inductors
- Topic: RL high-pass at speaker level
- Replies: 10
- Views: 43240
Re: RL high-pass at speaker level
Actually.... since the device being high passed typically also needs attenuation the "Rf" can also be part of the pad and then a shunt inductor added as the filter element. Assuming around 6dB here is a LR compared to a typical capacitor + autoformer. The big difference between the two wil...
- Fri Apr 28, 2023 1:56 pm
- Forum: Inductors
- Topic: RL high-pass at speaker level
- Replies: 10
- Views: 43240
Re: RL high-pass at speaker level
Not that I can come up with for this situation. The RL filter requires a series resistance and a shunt inductor and the closest I can come is using the output impedance of the amplifier as the source Z and a shunt inductor but that will unduly load down the source at low frequencies. If say 6dB of H...
- Thu Apr 06, 2023 1:29 am
- Forum: Inductors
- Topic: RL high-pass at speaker level
- Replies: 10
- Views: 43240
Re: RL high-pass at speaker level
You would have to sim it but this should work... you may need a shunt resistor across the entire choke to get things stable since the impedance curve can get wonky with the stepup from the tapped choke.
dave
dave
- Sat Apr 01, 2023 11:56 am
- Forum: Transformers
- Topic: Autoformer for Klipsch crossover
- Replies: 15
- Views: 42220
Re: Autoformer for Klipsch crossover
This comes down to the applied voltage and crossover frequency. 80% nickel has a saturation of 1/2 that of the supplied 49% which is the difference between 500Hz and 1000Hz or 2W and 8W.
dave
dave
- Sun Mar 19, 2023 9:33 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
pp
- Sat Mar 18, 2023 12:51 am
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
pj
- Sun Feb 26, 2023 2:47 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
mnb
- Mon Feb 13, 2023 3:22 pm
- Forum: Phono
- Topic: Stereo to Mono
- Replies: 11
- Views: 14106
Re: Stereo to Mono
since these are simple input transformers the autoformer size would be fine. you should get 1:2 My first thought would be bifilar but I think the ground shift would "get you" at high frequencies.
dave
dave
- Fri Jan 27, 2023 1:07 pm
- Forum: Attenuators
- Topic: Original AVC pcb and switch available seperately
- Replies: 2
- Views: 30674
Re: Original AVC pcb and switch available seperately
I do not follow.
The original $200 AVC's will not fit on the module PCB that has the integrated switches.
dave
The original $200 AVC's will not fit on the module PCB that has the integrated switches.
dave
- Tue Jan 17, 2023 9:46 pm
- Forum: Your name here.
- Topic: moe pics
- Replies: 78
- Views: 616605
Re: moe pics
tt