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Technology and science are two hobbies of mine, both of which fascinate me immensely.
Especially when we travel in the campervan, I have time to delve deeper and sometimes even conduct a little exper ...

I’m sorry, forgot to inform you about the DMF…
But now you can attend:
Yes, it is... We're back! It took a while, but we did it again: Dutch Modular Fest 2025 is here! On Saturday 6 September, y ...

Your buttons reminds me of a device I made for a brother of mine: It works like a bass guitar and the buttons are arranged accordingly.
With the black and red buttons one can set the octave for the l ...

Great, I love tube stuff.
Although I learned electronics during the tube periode/start of transistor era (think oc71 etc.) I never build anything using tubes….

Since you have a lot of overhead in both voltage and power, I see no problems in powering this amplifier with pos and neg 12 volt.

Thanks!
I wasn't happy with the software and have been tweaking today.
Much better functionality now.

I've made what I call a DRONER, It's a standallone module around an Arduino UNO, programmed as a native midi device ( google HIDUINO) for sending Midi over USB.
You can choose a note, change velocit ...

Best practice is to connect a capacitor say about 100nF close to the supply pins of each ic and a large one (about 100uF) where the power supply enters the board.
You might want to connect a small fi ...

I think the inside is better looking as the outside 😁👍🏻
Nice job!

If you go here:
https://www.falstad.com/circuit/circuitjs.html
You can build circuits and test them out, so you can play with resistor values etc.
That said: The attennuverter is a very smart circu ...

For the right three opamps I'd use three attennuverters so you can have a volume setting and invert the signal with the same potentiometer

I had a similar hum problem. I have to add that almost all my patchcords are made from a single wire.
The idea is that output impedances are low and voltage amplitudes are high.
So what I did was co ...

Yes, it does have send returns for extern fx, some from the eurorack, or a fx case I have.
My studio doesn’t need much space, the small euro case you can see on the picture already has 12 outputs� ...

Not realy a build picture, but a repair picture this time.
This 24 channel mixing table was donated to me since it was defective.
But after a morning working on it I found 2 false soldering points a ...

My MODDER is an ESP32 based module to convert the input signal according to a chosen conversion.

I really like the functionality of your module. In fact, I may adapt your idea to my Arduino-based ...

sure, look at 1.40

My MODDER is an ESP32 based module to convert the input signal according to a chosen conversion.The input signal in this patch comes from the O&C module on the left (an Attack-Decay signal).
...

Srry, can't help you here

Unfortunately I wasn’t able to attend to this last solstice event (I totally forgot it due to my vacation) but luckely there are downloads to listen.
Thanks!

I print my panels with (mostly) two colors pla+
The characters are embossed so when the printer starts printing the characters, I pause the printer and change color.
For the design I use Fusion 360 ...

If you are patient, I can look at home in my collection.
Recently I got a lot of different ic’s from a befriended engineer, but it will take at least till juli 2024 before I can check it out.
The ...

Just set it to 12 volt and your set.

There are also companies/people who copyright claim the music you post on YouTube.
You can fight this claim, but that will take some weeks.
During these weeks you receive no money (if you normally d ...

Why don’t you use a TLC0820, that is an 8 bit flash ADC.
Sample time max. 2.5uSec, 5 volt supply.
Use the 4 highest bits…

First thing I noticed when glancing over the schematic is the 100k pot at the cv input.
This is far to large impedance since it is in series with the led(s)
Why don’t you use the spare opamp to bu ...

Author	Message
Topic: Tested: Albert Einstein Theory of Relativity
Grumble Replies: 1 Views: 39	Posted: Sat Aug 23, 2025 8:26 am Subject: Tested: Albert Einstein Theory of Relativity Subject description: Amazing results! Forum: Discussion » Schmooze
Grumble Replies: 1 Views: 39	Technology and science are two hobbies of mine, both of which fascinate me immensely. Especially when we travel in the campervan, I have time to delve deeper and sometimes even conduct a little exper ...
Topic: Dutch Modular Fest, The Hague
Grumble Replies: 8 Views: 11847	Posted: Thu Aug 21, 2025 6:51 am Subject: Dutch Modular Fest, The Hague Forum: electro-music.com » electro-music festivals
Grumble Replies: 8 Views: 11847	I’m sorry, forgot to inform you about the DMF… But now you can attend: Yes, it is... We're back! It took a while, but we did it again: Dutch Modular Fest 2025 is here! On Saturday 6 September, y ...
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Thu Aug 21, 2025 4:28 am Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	Your buttons reminds me of a device I made for a brother of mine: It works like a bass guitar and the buttons are arranged accordingly. With the black and red buttons one can set the octave for the l ...
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Tue Aug 12, 2025 7:21 am Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	Great, I love tube stuff. Although I learned electronics during the tube periode/start of transistor era (think oc71 etc.) I never build anything using tubes….
Topic: Stupid question about boosted op-amp circuit
Grumble Replies: 2 Views: 318	Posted: Thu Jul 24, 2025 12:19 am Subject: Stupid question about boosted op-amp circuit Forum: DIY Hardware and Software
Grumble Replies: 2 Views: 318	Since you have a lot of overhead in both voltage and power, I see no problems in powering this amplifier with pos and neg 12 volt.
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Sun Jul 20, 2025 1:28 pm Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	Thanks! I wasn't happy with the software and have been tweaking today. Much better functionality now.
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Fri Jul 18, 2025 12:36 pm Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	I've made what I call a DRONER, It's a standallone module around an Arduino UNO, programmed as a native midi device ( google HIDUINO) for sending Midi over USB. You can choose a note, change velocit ...
Topic: Several IC circuits from one battery.
Grumble Replies: 1 Views: 398	Posted: Tue May 06, 2025 2:50 am Subject: Several IC circuits from one battery. Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Grumble Replies: 1 Views: 398	Best practice is to connect a capacitor say about 100nF close to the supply pins of each ic and a large one (about 100uF) where the power supply enters the board. You might want to connect a small fi ...
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Mon May 05, 2025 6:52 am Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	I think the inside is better looking as the outside 😁👍🏻 Nice job!
Topic: Op Amp to split sequencer voltage?
Grumble Replies: 8 Views: 1053	Posted: Sun Apr 20, 2025 11:55 am Subject: Op Amp to split sequencer voltage? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Grumble Replies: 8 Views: 1053	If you go here: https://www.falstad.com/circuit/circuitjs.html You can build circuits and test them out, so you can play with resistor values etc. That said: The attennuverter is a very smart circu ...
Topic: Op Amp to split sequencer voltage?
Grumble Replies: 8 Views: 1053	Posted: Fri Apr 18, 2025 4:06 am Subject: Op Amp to split sequencer voltage? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Grumble Replies: 8 Views: 1053	For the right three opamps I'd use three attennuverters so you can have a volume setting and invert the signal with the same potentiometer
Topic: A very persistent and hard to identify grounding problem
Grumble Replies: 1 Views: 589	Posted: Mon Apr 07, 2025 1:27 pm Subject: A very persistent and hard to identify grounding problem Forum: DIY Hardware and Software » The Repair Shop
Grumble Replies: 1 Views: 589	I had a similar hum problem. I have to add that almost all my patchcords are made from a single wire. The idea is that output impedances are low and voltage amplitudes are high. So what I did was co ...
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Thu Mar 06, 2025 11:25 am Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	Yes, it does have send returns for extern fx, some from the eurorack, or a fx case I have. My studio doesn’t need much space, the small euro case you can see on the picture already has 12 outputs� ...
Topic: Build Pictures 2025
Grumble Replies: 53 Views: 7505	Posted: Tue Mar 04, 2025 12:08 am Subject: Build Pictures 2025 Forum: DIY Hardware and Software
Grumble Replies: 53 Views: 7505	Not realy a build picture, but a repair picture this time. This 24 channel mixing table was donated to me since it was defective. But after a morning working on it I found 2 false soldering points a ...
Topic: 2024 Build Pictures
Grumble Replies: 22 Views: 4967	Posted: Thu Sep 26, 2024 2:43 pm Subject: 2024 Build Pictures Forum: DIY Hardware and Software
Grumble Replies: 22 Views: 4967	My MODDER is an ESP32 based module to convert the input signal according to a chosen conversion. I really like the functionality of your module. In fact, I may adapt your idea to my Arduino-based ...
Topic: 2024 Build Pictures
Grumble Replies: 22 Views: 4967	Posted: Sun Sep 08, 2024 2:12 pm Subject: 2024 Build Pictures Forum: DIY Hardware and Software
Grumble Replies: 22 Views: 4967	sure, look at 1.40
Topic: 2024 Build Pictures
Grumble Replies: 22 Views: 4967	Posted: Sat Sep 07, 2024 12:08 am Subject: 2024 Build Pictures Forum: DIY Hardware and Software
Grumble Replies: 22 Views: 4967	My MODDER is an ESP32 based module to convert the input signal according to a chosen conversion.The input signal in this patch comes from the O&C module on the left (an Attack-Decay signal). ...
Topic: Wanted: CD4062
Grumble Replies: 7 Views: 2139	Posted: Fri Jul 12, 2024 4:40 am Subject: Wanted: CD4062 Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Grumble Replies: 7 Views: 2139	Srry, can't help you here
Topic: June Solstice Concert
Grumble Replies: 28 Views: 7938	Posted: Thu Jun 27, 2024 10:58 am Subject: June Solstice Concert Forum: electro-music.com » Streaming Radio Station
Grumble Replies: 28 Views: 7938	Unfortunately I wasn’t able to attend to this last solstice event (I totally forgot it due to my vacation) but luckely there are downloads to listen. Thanks!
Topic: Panel design?
Grumble Replies: 2 Views: 1244	Posted: Mon Jun 17, 2024 8:15 am Subject: Panel design? Forum: DIY Hardware and Software
Grumble Replies: 2 Views: 1244	I print my panels with (mostly) two colors pla+ The characters are embossed so when the printer starts printing the characters, I pause the printer and change color. For the design I use Fusion 360 ...
Topic: Wanted: CD4062
Grumble Replies: 7 Views: 2139	Posted: Fri Jun 07, 2024 10:05 pm Subject: Wanted: CD4062 Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Grumble Replies: 7 Views: 2139	If you are patient, I can look at home in my collection. Recently I got a lot of different ic’s from a befriended engineer, but it will take at least till juli 2024 before I can check it out. The ...
Topic: can I use my dotcom psu for euro?
Grumble Replies: 3 Views: 972	Posted: Tue May 14, 2024 11:50 pm Subject: can I use my dotcom psu for euro? Forum: DIY Hardware and Software » The Repair Shop
Grumble Replies: 3 Views: 972	Just set it to 12 volt and your set.
Topic: Making money with YouTube - personal experience
Grumble Replies: 8 Views: 29409	Posted: Fri Apr 26, 2024 11:23 pm Subject: Making money with YouTube - personal experience Forum: Reviews, Editorials and Commentary » Commentary and Editorials
Grumble Replies: 8 Views: 29409	There are also companies/people who copyright claim the music you post on YouTube. You can fight this claim, but that will take some weeks. During these weeks you receive no money (if you normally d ...
Topic: Paia EK-7 Digitizer (4 Bit ADC)
Grumble Replies: 10 Views: 15328	Posted: Thu Dec 21, 2023 3:45 am Subject: Paia EK-7 Digitizer (4 Bit ADC) Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Grumble Replies: 10 Views: 15328	Why don’t you use a TLC0820, that is an 8 bit flash ADC. Sample time max. 2.5uSec, 5 volt supply. Use the 4 highest bits…
Topic: Issues constructing Reverse Avalanche Oscillators.
Grumble Replies: 6 Views: 4085	Posted: Thu Sep 28, 2023 11:09 pm Subject: Issues constructing Reverse Avalanche Oscillators. Forum: DIY Hardware and Software
Grumble Replies: 6 Views: 4085	First thing I noticed when glancing over the schematic is the 100k pot at the cv input. This is far to large impedance since it is in series with the led(s) Why don’t you use the spare opamp to bu ...