Search found 507 matches
- 10 Mar 2024, 20:18
- Forum: Parts & Tools Sourcing & Trading
- Topic: Ordering from Tayda? Customs & taxes in the EU
- Replies: 6
- Views: 2035
Re: Ordering from Tayda? Customs & taxes in the EU
DDP from Tayda would be nice, however - I haven't been able to find the option on the site
- 06 Dec 2023, 13:52
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: PedalPCB sproing [SOLVED]
- Replies: 4
- Views: 5746
Re: PedalPCB sproing [SOLVED]
Sounds odd. Could you measure the voltages on all 8 pins of IC2 and list them here.
- 22 Aug 2023, 19:19
- Forum: DIY Projects
- Topic: Dual output buffer/splitter design
- Replies: 16
- Views: 2037
Re: Dual output buffer/splitter design
I whipped up a simulation of a single buffer, to see what's going on. Admittedly, I got the BE-bypass cap all wrong. My intuition told me that C1 would begin conducting at the break frequency of the high-pass filter created by C1 and R1, and short out the BE junction - effectively bypassing the tran...
- 22 Aug 2023, 04:43
- Forum: DIY Projects
- Topic: Dual output buffer/splitter design
- Replies: 16
- Views: 2037
Re: Dual output buffer/splitter design
I am sure the Cornish buffer is well thought out. My intention was to bash the PCB I did way before I had any idea about proper layout techniques. Perhaps that didn't come across properly. My bad :) My concern was with the configuration presented here: https://www.freestompboxes.org/viewtopic.php?p=...
- 21 Aug 2023, 19:50
- Forum: DIY Projects
- Topic: Dual output buffer/splitter design
- Replies: 16
- Views: 2037
Re: Dual output buffer/splitter design
I know I did a layout for the Cornish buffer. That was a long time ago. I wouldn't put too much faith into that one these days ;) I never really got the idea about the base-emitter bypass cap. It effectively disables the transistor gain af high frequencies. I would most definitely get rid of that! :...
- 21 Aug 2023, 13:33
- Forum: DIY Projects
- Topic: Dual output buffer/splitter design
- Replies: 16
- Views: 2037
Re: Dual output buffer/splitter design
Both will function just fine.
For the discrete solution, I would go for BJT's instead of JFET's, since they are more robust against ESD and way more available.
For the discrete solution, I would go for BJT's instead of JFET's, since they are more robust against ESD and way more available.
- 27 Jul 2023, 21:22
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Morning Glory problem with 2N5457
- Replies: 19
- Views: 1985
Re: Morning Glory problem with 2N5457
Assuming the aionFX version has been tested ok, maybe it's an idea to compare the two schematics for differences:
https://aionfx.com/app/files/docs/cerul ... ion_v1.pdf
https://aionfx.com/app/files/docs/cerul ... ion_v1.pdf
- 27 Jul 2023, 21:08
- Forum: Vintage Stompbox Corner ( ... - 1975)
- Topic: Mirano - EF-1 - Exciting Fuzz [schematic]
- Replies: 21
- Views: 13295
Re: Mirano - EF-1 - Exciting Fuzz [schematic]
You've got it It's listed in the schematic as well:
- 27 Jul 2023, 17:14
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Morning Glory problem with 2N5457
- Replies: 19
- Views: 1985
Re: Morning Glory problem with 2N5457
I have had issues with 2Nxxxx JFET's from different manufacturers having mirrored pinouts. Check the specific datasheet from the manufacturer of your transistor and verify that it is mounted correctly.
- 13 Jun 2023, 08:34
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: Diezel VH4 Pedal [schematic]
- Replies: 284
- Views: 171875
Re: Diezel VH4 Pedal help [schematic]
Help!!!!!! I’m building a PCB Mania Benzin Vh4. I have signal passing however is quiet and has very little gain. Sounds more like a light overdrive. There is a lot of noise and whining specifically when I touch the gain pot with it maxed. I swapped out the pot for a spare I had laying around with t...
- 13 Jun 2023, 07:58
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: Diezel VH4 Pedal [schematic]
- Replies: 284
- Views: 171875
Re: Diezel VH4 Pedal [schematic]
I did some simulations of this circuit in LTspice and I was actually quite puzzled at the behaviour of the zener diodes in the feedback loop of the 2nd gain stage. All plots taken just after the gain stage w/5.6V zeners: - In blue, no diodes. - In red, D815A diode model. - In turquoise, BZX384B dio...
- 23 Mar 2023, 10:27
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: MXR M87 / 1176 Pics
- Replies: 2
- Views: 2383
Re: MXR M87 / 1176 Pics
High resolution gut shots from somewhere...
- 07 Mar 2023, 04:47
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
It's a passive first-order low-pass filter with a corner frequency of 1/(2*pi*R*C)
Look up passive RC filters for more info
Look up passive RC filters for more info
- 17 Feb 2023, 23:07
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: T-Rex Replica delay schematic
- Replies: 2
- Views: 645
Re: T-Rex Replica delay schematic
Take the pedal apart, and take high resolution pictures of both sides of the PCB and upload them here. Then we might be able to help you
- 13 Feb 2023, 21:43
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
- 09 Feb 2023, 07:08
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
Agreed, interwinding capacitance and cable capacitance won't improve the matter. However, interwinding capacitance is negligible as it is mostly series coupled. Cable capacitance on the other hand could very well be a contributing factor. At 150pF/m cables can't be longer than a few meters before ha...
- 08 Feb 2023, 08:43
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
Manfred, I respectfully disagree on your comments on the significance of miller capacitance, when taking pickup inductance and winding resistance into account. Below is a simulation of the circuit where the gain setting is stepped. The top plot shows input impedance while the bottom plot shows overa...
- 06 Feb 2023, 23:19
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
Except for a noise level reduction, a parallel connection of the transistors does not change anything. Each silicon small signal transistor can be replaced by any other in the low frequency range. The invidual internal capacitances of these only have an effect in the high frequency range. I ran som...
- 05 Feb 2023, 20:57
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
IMG_20230205_214421.jpg This is probably a good starting point for experimentation. There are too many uncontrolled variables to my liking in this design. Output impedance is high, and input impedance is low. Input impedance varies with the gain setting, and output impedance varies with the output ...
- 04 Feb 2023, 09:52
- Forum: Boutique Stompboxes dissected...
- Topic: The Beatles Pedal
- Replies: 32
- Views: 4351
Re: The Beatles Pedal
Agreed - 10K log taper for the gain control sounds like a sensible value.
Volume pots should be log taper as well. 500K log would be a good starting point. Lower values than that will start to impact the maximum available gain from the common emitter amplifier severely.
Volume pots should be log taper as well. 500K log would be a good starting point. Lower values than that will start to impact the maximum available gain from the common emitter amplifier severely.