Search found 52 matches

I was aware that in the 555 astable, duty cycle and frequency were interdependent. But I ran through a couple of calculators I found online (DigiKey and some other places have them), and for the audi ...

I built a 555 based oscillator according to the schematic attached. Recently I picked up an o-scope, and I hooked up the probes to take a look. I was surprised to see that the duty cycle for the osc ...

I have a working synth module bread boarded up
It's 3 555 square waves, a quad nand, a quad XOR, and a quad op amp. All the function appear to work, but it's super glitchy--I think it's just the r ...

thank you! I will definitely give it a spin. It will really help, to have schematics of all the devices--to help in trouble shooting, or future repairs or upgrades. I ahd a box of pandemic era stu ...

I've been monkeying around trying to find a decent free PCB/schematic drawing software. I tried Libre and Circuit Maker, but after installing every component library I could find, it still didn't hav ...

Some time ago I built a 40106 based NAND drone synth. 3 oscillators drive 3 NAND gates. Ie, Osc. 1 drives NAND 1 and 3. Osc. 2 drives 1 and 3, and Osc 3 drives 2 and 3.

With careful tuning, i ...

Thank you for the schematic. I'm trying to study up and learn op-amp circuits. Can you tell me what the benefit of using the inverting input would be?

It also brings up another question. I've see ...

Ah, I see. the first op-amp stage isolates the sequencer from the everything down stream. Then the voltage modifications are made with the pots, and the next op amp stage isolates all down stream os ...

I'll breadboard it up before I commit to anything.

I just broke down and ordered an import o-scope. Trying to build oscillator circuits without that has been driving me nuts! My only diagnostic ...

I've spent the past weeks building a kind of drone-synth. It has 3 555 based and 3 4046 based VCOs. The device is set up with the VCOs switchabe, so that 3 of them feed 3 NAND gates. The individual ...

That does help. I guess I'm wondering, I hear a lot of things mentioning "loading" a chip--if I take a CV out of it, that it can load the output and inadvertently change the frequency.

I ...

I finally broke down an picked up an oscilloscope. Trying to trouble shoot and tweak circuits without one is becoming a joke.

I'm planning out some VCO circuits (just recieved my kit for a Baby ...

I've been trying to work out how to drive 2 of 3 different 555 control voltages from the same sourece. From the same sequencer, or as in the attached, from the same modulating frequency in a dub sire ...

I dug out ny old dub siren, and realized it has an op amp stage between the modulator (the first stage) and the cv input of the next stage. This weekend I want ro give that a try--run the sequencer o ...

Thanks for the info PhoBos. I'll think it all over and do some reading.

I am curious though, if a simple pot voltage divider setup didn't work, do you think the original circuit would work, with 2 ...

I've got a couple APCs laying around, and I messed around a little bit with using the voltage control inputs on the 556 chip.

I was just thinking about something on the way home from the shop. Rat ...

Ah, that makes sense-if ths diode is oriented and you only have positive current, theirs nothing to block.

I'm curious then, why do circuits (like the beavis audio circuit) utilize resistor/diode ...

Thanks for the info. I was doing some reading on diodes as resistors.

I'm trying to explore this further as Nic Collins in his book, and the schematic from Beavis Audio both mentioned diodes as ha ...

I built a device very similar to the one in the attachment. I used 555 oscillators (left hand side) because they are easy to run with voltage control. But the NAND stage is the same.
Honestly, the r ...

I appreciate this forum going easy on people new but trying to learn...

I ordered all the stuff for a sequencer, dc power supply, and low-power amplifer build.

I hated my "smokey" amp ...

I've done some more reading, and was wondering if a CV configuration like this would be more suitable for the instance of driving LEDS for use in a vactrol. A transistor unity gain buffer? That shou ...

Hmm, a buffer on the CV output? Would it require 8 buffers, or, because all the CVs are tied together, could you run just one buffer?

I'll have to look into how to do that. I'm assuming you mean ...

Thank you so much for the info! I've been moving towards building from scratch (vs. kits) and trying to learn as much along the way as possible. A sequencer will make all my noisy gizmos a lot more ...

I tried emailing the author directly, but the message was bounced back.
I'm hoping to build a "baby-8" sequencer, and this seemed to be the clearest schematic that I could find. I'm not ...

The other day, I found an intruiging circuit that used either 555 or 40106 oscillators, and ultimately ran them through a phase-locked loop chip.

I've been digging through my internet history for a ...

Author	Message
Topic: 555 astable osc. Duty cycle questions
Dr. K Replies: 4 Views: 112	Posted: Wed May 07, 2025 2:07 pm Subject: 555 astable osc. Duty cycle questions Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 4 Views: 112	I was aware that in the 555 astable, duty cycle and frequency were interdependent. But I ran through a couple of calculators I found online (DigiKey and some other places have them), and for the audi ...
Topic: 555 astable osc. Duty cycle questions
Dr. K Replies: 4 Views: 112	Posted: Tue May 06, 2025 4:39 pm Subject: 555 astable osc. Duty cycle questions Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 4 Views: 112	I built a 555 based oscillator according to the schematic attached. Recently I picked up an o-scope, and I hooked up the probes to take a look. I was surprised to see that the duty cycle for the osc ...
Topic: Several IC circuits from one battery.
Dr. K Replies: 1 Views: 76	Posted: Mon May 05, 2025 1:15 pm Subject: Several IC circuits from one battery. Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 1 Views: 76	I have a working synth module bread boarded up It's 3 555 square waves, a quad nand, a quad XOR, and a quad op amp. All the function appear to work, but it's super glitchy--I think it's just the r ...
Topic: Best free PCB/Schematic software?
Dr. K Replies: 4 Views: 399	Posted: Sat May 03, 2025 4:49 pm Subject: Best free PCB/Schematic software? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 4 Views: 399	thank you! I will definitely give it a spin. It will really help, to have schematics of all the devices--to help in trouble shooting, or future repairs or upgrades. I ahd a box of pandemic era stu ...
Topic: Best free PCB/Schematic software?
Dr. K Replies: 4 Views: 399	Posted: Fri May 02, 2025 4:15 pm Subject: Best free PCB/Schematic software? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 4 Views: 399	I've been monkeying around trying to find a decent free PCB/schematic drawing software. I tried Libre and Circuit Maker, but after installing every component library I could find, it still didn't hav ...
Topic: 555 vs. 4046 based VCOs
Dr. K Replies: 2 Views: 282	Posted: Sun Apr 20, 2025 5:36 am Subject: 555 vs. 4046 based VCOs Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 2 Views: 282	Some time ago I built a 40106 based NAND drone synth. 3 oscillators drive 3 NAND gates. Ie, Osc. 1 drives NAND 1 and 3. Osc. 2 drives 1 and 3, and Osc 3 drives 2 and 3. With careful tuning, i ...
Topic: Op Amp to split sequencer voltage?
Dr. K Replies: 8 Views: 468	Posted: Sun Apr 20, 2025 5:08 am Subject: Op Amp to split sequencer voltage? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 8 Views: 468	Thank you for the schematic. I'm trying to study up and learn op-amp circuits. Can you tell me what the benefit of using the inverting input would be? It also brings up another question. I've see ...
Topic: Op Amp to split sequencer voltage?
Dr. K Replies: 8 Views: 468	Posted: Mon Apr 14, 2025 1:54 pm Subject: Op Amp to split sequencer voltage? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 8 Views: 468	Ah, I see. the first op-amp stage isolates the sequencer from the everything down stream. Then the voltage modifications are made with the pots, and the next op amp stage isolates all down stream os ...
Topic: Op Amp to split sequencer voltage?
Dr. K Replies: 8 Views: 468	Posted: Mon Apr 14, 2025 1:15 pm Subject: Op Amp to split sequencer voltage? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 8 Views: 468	I'll breadboard it up before I commit to anything. I just broke down and ordered an import o-scope. Trying to build oscillator circuits without that has been driving me nuts! My only diagnostic ...
Topic: Op Amp to split sequencer voltage?
Dr. K Replies: 8 Views: 468	Posted: Mon Apr 14, 2025 12:44 pm Subject: Op Amp to split sequencer voltage? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 8 Views: 468	I've spent the past weeks building a kind of drone-synth. It has 3 555 based and 3 4046 based VCOs. The device is set up with the VCOs switchabe, so that 3 of them feed 3 NAND gates. The individual ...
Topic: Using a 40106 as a unity gain buffer
Dr. K Replies: 6 Views: 166	Posted: Fri Apr 04, 2025 4:43 pm Subject: Using a 40106 as a unity gain buffer Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 166	That does help. I guess I'm wondering, I hear a lot of things mentioning "loading" a chip--if I take a CV out of it, that it can load the output and inadvertently change the frequency. I ...
Topic: Using a 40106 as a unity gain buffer
Dr. K Replies: 6 Views: 166	Posted: Fri Apr 04, 2025 3:49 pm Subject: Using a 40106 as a unity gain buffer Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 166	I finally broke down an picked up an oscilloscope. Trying to trouble shoot and tweak circuits without one is becoming a joke. I'm planning out some VCO circuits (just recieved my kit for a Baby ...
Topic: Running several 555 Control voltages from one source
Dr. K Replies: 0 Views: 212	Posted: Mon Mar 17, 2025 3:01 pm Subject: Running several 555 Control voltages from one source Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 0 Views: 212	I've been trying to work out how to drive 2 of 3 different 555 control voltages from the same sourece. From the same sequencer, or as in the attached, from the same modulating frequency in a dub sire ...
Topic: Voltage controlled APC--a question about the voltage inputs
Dr. K Replies: 5 Views: 556	Posted: Thu Mar 13, 2025 1:23 pm Subject: Voltage controlled APC--a question about the voltage inputs Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 5 Views: 556	I dug out ny old dub siren, and realized it has an op amp stage between the modulator (the first stage) and the cv input of the next stage. This weekend I want ro give that a try--run the sequencer o ...
Topic: Voltage controlled APC--a question about the voltage inputs
Dr. K Replies: 5 Views: 556	Posted: Sun Mar 02, 2025 3:30 pm Subject: Voltage controlled APC--a question about the voltage inputs Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 5 Views: 556	Thanks for the info PhoBos. I'll think it all over and do some reading. I am curious though, if a simple pot voltage divider setup didn't work, do you think the original circuit would work, with 2 ...
Topic: Voltage controlled APC--a question about the voltage inputs
Dr. K Replies: 5 Views: 556	Posted: Sun Feb 16, 2025 4:47 pm Subject: Voltage controlled APC--a question about the voltage inputs Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 5 Views: 556	I've got a couple APCs laying around, and I messed around a little bit with using the voltage control inputs on the 556 chip. I was just thinking about something on the way home from the shop. Rat ...
Topic: Question about diode vs. resistive mixing
Dr. K Replies: 6 Views: 3290	Posted: Sat Jan 04, 2025 3:28 pm Subject: Question about diode vs. resistive mixing Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 3290	Ah, that makes sense-if ths diode is oriented and you only have positive current, theirs nothing to block. I'm curious then, why do circuits (like the beavis audio circuit) utilize resistor/diode ...
Topic: Question about diode vs. resistive mixing
Dr. K Replies: 6 Views: 3290	Posted: Sat Jan 04, 2025 5:31 am Subject: Question about diode vs. resistive mixing Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 3290	Thanks for the info. I was doing some reading on diodes as resistors. I'm trying to explore this further as Nic Collins in his book, and the schematic from Beavis Audio both mentioned diodes as ha ...
Topic: Question about diode vs. resistive mixing
Dr. K Replies: 6 Views: 3290	Posted: Fri Jan 03, 2025 4:54 pm Subject: Question about diode vs. resistive mixing Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 3290	I built a device very similar to the one in the attachment. I used 555 oscillators (left hand side) because they are easy to run with voltage control. But the NAND stage is the same. Honestly, the r ...
Topic: Small amplifier--buffered input or not?
Dr. K Replies: 0 Views: 282	Posted: Fri Dec 27, 2024 3:51 pm Subject: Small amplifier--buffered input or not? Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 0 Views: 282	I appreciate this forum going easy on people new but trying to learn... I ordered all the stuff for a sequencer, dc power supply, and low-power amplifer build. I hated my "smokey" amp ...
Topic: 8-Step Seq.---a few questions about a schematic
Dr. K Replies: 6 Views: 1630	Posted: Mon Dec 16, 2024 4:12 pm Subject: 8-Step Seq.---a few questions about a schematic Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 1630	I've done some more reading, and was wondering if a CV configuration like this would be more suitable for the instance of driving LEDS for use in a vactrol. A transistor unity gain buffer? That shou ...
Topic: 8-Step Seq.---a few questions about a schematic
Dr. K Replies: 6 Views: 1630	Posted: Sun Dec 15, 2024 5:34 pm Subject: 8-Step Seq.---a few questions about a schematic Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 1630	Hmm, a buffer on the CV output? Would it require 8 buffers, or, because all the CVs are tied together, could you run just one buffer? I'll have to look into how to do that. I'm assuming you mean ...
Topic: 8-Step Seq.---a few questions about a schematic
Dr. K Replies: 6 Views: 1630	Posted: Thu Dec 12, 2024 3:57 pm Subject: 8-Step Seq.---a few questions about a schematic Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 1630	Thank you so much for the info! I've been moving towards building from scratch (vs. kits) and trying to learn as much along the way as possible. A sequencer will make all my noisy gizmos a lot more ...
Topic: 8-Step Seq.---a few questions about a schematic
Dr. K Replies: 6 Views: 1630	Posted: Wed Dec 11, 2024 5:24 pm Subject: 8-Step Seq.---a few questions about a schematic Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 6 Views: 1630	I tried emailing the author directly, but the message was bounced back. I'm hoping to build a "baby-8" sequencer, and this seemed to be the clearest schematic that I could find. I'm not ...
Topic: Drone Synth---Oscillators mixed through PLL
Dr. K Replies: 1 Views: 468	Posted: Tue Nov 19, 2024 2:54 pm Subject: Drone Synth---Oscillators mixed through PLL Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Dr. K Replies: 1 Views: 468	The other day, I found an intruiging circuit that used either 555 or 40106 oscillators, and ultimately ran them through a phase-locked loop chip. I've been digging through my internet history for a ...