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| Page 1 of 6 [146 Posts] | Goto page: 1, 2, 3, 4, 5, 6 Next |
| Author | Message |
|---|---|
 Topic: Best free PCB/Schematic software? |
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| elektrouwe Replies: 7 Views: 2239 |
Posted: Sat May 03, 2025 9:33 am Subject:
Best free PCB/Schematic software?
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| +1 more for KICAD - nothing else ! | |
| Topic: Lunetta instruments workshop & free CMOS handbook download |
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| elektrouwe Replies: 8 Views: 1641 |
Posted: Thu Mar 20, 2025 9:23 am Subject:
Re: Lunetta instruments workshop & free CMOS handbook download
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| ...Could you upload it here please?
dBm looks like a fun festival - it is not far from Stuttgart it seems? gotcha  uploaded
yes, my location is close to Stuttgart. Would be great if you ... |
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| Topic: Lunetta instruments workshop & free CMOS handbook download |
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| elektrouwe Replies: 8 Views: 1641 |
Posted: Thu Mar 20, 2025 1:27 am Subject:
Lunetta instruments workshop & free CMOS handbook download
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| dear Lunetta builders,
I am pleased to announce [url=https://www.kulturgueter-schuppen.de/books/dead-battery-music-dbm-circuits/page/dbm-2025-workshop-festival] dBm - dead Battery music - DIY worksh ... |
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| Topic: Paia EK-7 Digitizer (4 Bit ADC) |
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| elektrouwe Replies: 10 Views: 15790 |
Posted: Tue Jan 09, 2024 8:33 am Subject:
Paia EK-7 Digitizer (4 Bit ADC)
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
|
Makes me wonder if it is possible to construct something like this but with a gray code output. https://www.analog.com/media/en/training-seminars/tutorials/MT-025.pdf |
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| Topic: Lunetta Touch Switches |
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| elektrouwe Replies: 7 Views: 4275 |
Posted: Tue Jun 13, 2023 12:18 am Subject:
Lunetta Touch Switches
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| all circuits shown here are missing ESD protection ! Do yourself a favour and add a >=100k series resistor between CMOS input and touch input components. A 4000CMOS is "ancient technology" ... | |
| Topic: Cd40106 kick |
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| elektrouwe Replies: 3 Views: 2821 |
Posted: Tue May 09, 2023 1:01 am Subject:
Re: Cd40106 kick
Subject description: 2 40106, 1 kick Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| for varying decay time you could add a potentiometer as variable load from IC2 out to pin14. | |
| Topic: How to achieve a freeze of certain logic states? |
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| elektrouwe Replies: 4 Views: 3651 |
Posted: Thu Apr 21, 2022 11:32 pm Subject:
Re: How to achieve a freeze of certain logic states?
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| I would like to be able to kind of freeze whatever combination i am pressing at a time, by means of another switch.
a D-FF is what you want. They come in dual (CD4013,..),quad (74HC175,..) and o ... |
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| Topic: who likes short shorts? |
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| elektrouwe Replies: 1 Views: 1605 |
Posted: Sun Dec 26, 2021 12:39 am Subject:
who likes short shorts?
Forum: DIY Hardware and Software |
| If VDD is >5V, I would add a 3k3..10k in series to all odd(or even) SR outputs. 4 resistors more is not a big deal... | |
| Topic: op amp as schmitt trigger problem |
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| elektrouwe Replies: 3 Views: 2323 |
Posted: Tue Dec 07, 2021 3:55 am Subject:
op amp as schmitt trigger problem
Forum: DIY Hardware and Software |
| hi Mike,you probably need a rail-to-rail opamp, or at least one swinging close to GND. A TL072 will not work, maybe a LM358 or TLC272.
But if you wantl to clock a CMOS counter, these can be too slow. ... |
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| Topic: DIY 8-BIT SAMPLER - ADVICE NEEDED |
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| elektrouwe Replies: 12 Views: 4605 |
Posted: Tue Nov 16, 2021 2:23 am Subject:
DIY 8-BIT SAMPLER - ADVICE NEEDED
Forum: DIY Hardware and Software |
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1. ADC/DAC: do you recommend routing the VCC separately too? give it a try, soldering 1 wire takes less time than our discussion 
You will gain design experience if you check out different idea ... |
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| Topic: DIY 8-BIT SAMPLER - ADVICE NEEDED |
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| elektrouwe Replies: 12 Views: 4605 |
Posted: Sun Nov 14, 2021 5:16 am Subject:
DIY 8-BIT SAMPLER - ADVICE NEEDED
Forum: DIY Hardware and Software |
| 1. ADC/DAC are considered analogue, right?
yes. But because both are also digital and produce current glitches on GND, I would route them separatly to the star GND point to avoid coupling this noise ... |
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| Topic: DIY 8-BIT SAMPLER - ADVICE NEEDED |
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| elektrouwe Replies: 12 Views: 4605 |
Posted: Fri Nov 12, 2021 2:23 am Subject:
DIY 8-BIT SAMPLER - ADVICE NEEDED
Forum: DIY Hardware and Software |
| ...
electrouwe: I was not aware of having to separate the digital (logic) and analog (opamps, etc) power/GND lines... google for "star ground" and you will find lots of information, why ... |
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| Topic: DIY 8-BIT SAMPLER - ADVICE NEEDED |
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| elektrouwe Replies: 12 Views: 4605 |
Posted: Thu Nov 11, 2021 1:44 am Subject:
Re: DIY 8-BIT SAMPLER - ADVICE NEEDED
Forum: DIY Hardware and Software |
| ...
5. took the ADC off…basically no signal into S-RAM…still popping!!! (that is the strangest thing…maybe something related to power source?)... Do you have a decoupling cap (100n cerco) in ... |
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| Topic: Rene Schmitz VCO3 updated schematic anyone? |
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| elektrouwe Replies: 7 Views: 4210 |
Posted: Wed Jul 28, 2021 3:48 am Subject:
Rene Schmitz VCO3 updated schematic anyone?
Forum: DIY Hardware and Software |
| Rene himself explains it very well here:
https://www.schmitzbits.de/expo_tutorial/index.html |
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| Topic: High speed CV multiplexer - inaccurate sampling |
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| elektrouwe Replies: 8 Views: 4122 |
Posted: Sun Mar 07, 2021 10:18 am Subject:
High speed CV multiplexer - inaccurate sampling
Forum: DIY Hardware and Software |
| 384kHz is not much more than 2us.
Not easy to design with cheap standard components for 12bit accuracy. If you are so limited in component supply you should consider using an 8 channel 12 bit DAC in ... |
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| Topic: High speed CV multiplexer - inaccurate sampling |
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| elektrouwe Replies: 8 Views: 4122 |
Posted: Sun Mar 07, 2021 5:59 am Subject:
Re: High speed CV multiplexer - inaccurate sampling
Subject description: I'm trying to make a high speed CV multiplexer to generate 16 CVs from a single dac, but have issues Forum: DIY Hardware and Software |
| ...
Because of the high refresh rate, I'm using a quite small capacitor 220-470pF) what is your refresh rate ? TL07x as S&H buffer is ok, but not as MUX driver; you may need a faster opamp wi ... |
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| Topic: Drive two 13700s with identical currents |
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| elektrouwe Replies: 6 Views: 3625 |
Posted: Sat Dec 19, 2020 2:13 am Subject:
Re: Drive two 13700s with identical currents
Subject description: How to control two 13700s with identical Iabc without crosstalk Forum: DIY Hardware and Software » Developers' Corner |
| ... One OTA is part of a triangle oscillator, the other charges the cap of a slaved saw oscillator. The idea is to make a dual-core VCO instead of doing triangle-to-saw conversion
you might check my ... |
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| Topic: Single Supply Antilog Generator |
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| elektrouwe Replies: 2 Views: 2109 |
Posted: Thu Jul 16, 2020 10:11 am Subject:
Re: LM3900 Antilog Generator
Subject description: How to build an antilog generator that works on a single-supply with the LM3900 Forum: DIY Hardware and Software |
| Over many years of research, I've been progressively putting together a unique SDIY synthesizer based on the inexpensive single-supply voltage "Norton" op amp, the LM3900. This one device is ... | |
| Topic: (thermal) noise generator |
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| elektrouwe Replies: 12 Views: 5007 |
Posted: Mon Jun 08, 2020 4:38 am Subject:
(thermal) noise generator
Forum: DIY Hardware and Software |
| Would this be a reasonable start?
no [ educational mode on ]. What would be the bandwidth given a 44Gohm source R and a 10pF input buffer capacity ? What happens if you load a 1mV voltage source ... |
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| Topic: A Commutating Transistor Vbe Matcher |
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| elektrouwe Replies: 3 Views: 3299 |
Posted: Mon Dec 23, 2019 5:08 am Subject:
A Commutating Transistor Vbe Matcher
Forum: DIY Hardware and Software |
| I had a similar idea some years ago:
https://www.muffwiggler.com/forum/topic-153845.html |
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| Topic: tap tempo circuit |
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| elektrouwe Replies: 9 Views: 7575 |
Posted: Mon Dec 16, 2019 1:25 pm Subject:
tap tempo circuit
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| I don't think I've seen a capacitor being used to add hysteresis before
I bet you have all saw core VCOs use this to generate a constant width reset pulse (to make sure C discharge is complete)
... |
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| Topic: tap tempo circuit |
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| elektrouwe Replies: 9 Views: 7575 |
Posted: Sun Dec 15, 2019 1:12 pm Subject:
tap tempo circuit
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| .. I was looking at U7 as being an integrator (because of C3) producing the ramp voltage but it isn't is it ?
U7 is only a comparator( with a small capacitive hysteresis). It compares the frozen ramp ... |
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| Topic: tap tempo circuit |
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| elektrouwe Replies: 9 Views: 7575 |
Posted: Sat Dec 14, 2019 11:43 am Subject:
tap tempo circuit
Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| ... that R2R is unfeasible in practise...
I would agree if this would be a "linear DAC" application like audio DAC or precision voltage generation. But in this app. DAC linearity is not so ... |
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| Topic: tap tempo circuit |
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| elektrouwe Replies: 9 Views: 7575 |
Posted: Fri Dec 13, 2019 3:25 am Subject:
tap tempo circuit
Subject description: 3 chip Lunetta metronome without microcontroller Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta |
| in times of 50cent 8 pin microcontrollers this circuit comes really 40 years too late. But hey, if you try to repair a defective ATTINY tapper in 10 years, you will be in deep sh*t with your present w ... | |
| Topic: Transistor gain bandwidth |
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| elektrouwe Replies: 8 Views: 5962 |
Posted: Thu Nov 28, 2019 6:34 am Subject:
Transistor gain bandwidth
Forum: DIY Hardware and Software » Developers' Corner |
| monotribe drums were designed for low cost, not for high hackability
The disadvantage of such a low component count filter circuit is, that cuttoff freq. ,Q-factor (resonance decay time) and outp ... |
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| Page 1 of 6 [146 Posts] | Goto page: 1, 2, 3, 4, 5, 6 Next |
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