Search found 110 matches

by analogmonster
Mon Sep 16, 2019 12:41 pm
Forum: Moog Music General Topics Forum
Topic: Share your synthesizer music!
Replies: 979
Views: 131926

Re: Share your synthesizer music!

Some tracks using Moog Modular, Prodigy etc.

Genres: Dub, Synth Rock, Ambient, Techno, Electro Punk

Soundcloud: https://soundcloud.com/analogmonster-1

YouTube: https://www.youtube.com/channel/UCnYrLi ... O_YNfM9YAw

Hope you like it :)
by analogmonster
Sat Aug 31, 2019 7:04 am
Forum: Modular Forum
Topic: 901B Rectangular wave adjustment
Replies: 3
Views: 3414

Re: 901B Rectangular wave adjustment

I added a PWM solution to the 901B circuit in my clone consisting of a "Moog-style" control voltage mixer in the PW / PWM section mixing the voltages of a PW pot and a PWM input jack. The result is fed into the same location of the original circuit like Gene proposed. LTSpice representation: Circuit...
by analogmonster
Fri Apr 27, 2018 3:19 am
Forum: Modular Forum
Topic: Moog Modular with MIDI
Replies: 11
Views: 4576

Re: Moog Modular with MIDI

Sounds like you need the 'trigger buffer' circuit in-line. I had this same problem manifest itself when I was restoring my R.A.Moog modular. Three EG's and then my added Minimoog was just too much for the trigger out of my keyboard, so I built some buffer circuits. Problem solved...! I had the same...
by analogmonster
Thu Apr 26, 2018 8:35 am
Forum: Modular Forum
Topic: 921B circuit question
Replies: 2
Views: 2017

Re: 921B circuit question

The 10k trimmer appears to be the phase lock filter cutoff in the service manual by looking at the pcb traces on the 921b board. I would assume that the phase lock filter balance is the 100r which it seems to be by also looking at a picture of the board. I'm not sure how you would set them though. ...
by analogmonster
Thu Apr 05, 2018 12:54 pm
Forum: Modular Forum
Topic: 921B circuit question
Replies: 2
Views: 2017

921B circuit question

Hi owners, technicians and other knowing people, one can find three trim pots within the sync part of the circuit, one is labeled "Phase Lock Offset" in the service manual (the one which adds a voltage to the OTA output IC13, zero adjust I assume), one is located between the outputs of the...
by analogmonster
Fri Oct 06, 2017 9:29 am
Forum: Modular Forum
Topic: 901 vs. 921
Replies: 9
Views: 4863

901 vs. 921

Hi owners, I read several times that the 901 sounds "better" or "smoother" than the 921. As a square is a square and a saw is a saw and so on: are there any measurable differences in the waveforms? An audible difference should be visible in osc pictures. I noticed some waveform a...
by analogmonster
Mon Sep 12, 2016 4:03 am
Forum: Modular Forum
Topic: 951 keyboard Relay question
Replies: 6
Views: 1735

Re: 951 keyboard Relay question

Ah, no, it provides the sample circuit with the keyboard voltage.
by analogmonster
Sun Sep 11, 2016 10:38 am
Forum: Modular Forum
Topic: 951 keyboard Relay question
Replies: 6
Views: 1735

Re: 951 keyboard Relay question

When a key is pressed the relay is switched on. The relay then charges the capacitor C1 according to the voltage value of the resistance chain interrupted by the pressed key. If portamento is switched on, this charging process is becoming slower corresponding to the portamento pot position. Portamen...
by analogmonster
Sun Jun 12, 2016 8:32 am
Forum: Moog Music General Topics Forum
Topic: Minimoog Tracking wrong when controlled from CV/Gate
Replies: 2
Views: 594

Re: Minimoog Tracking wrong when controlled from CV/Gate

Assumptions (I'm not a Minimoog owner): Perhaps your internal keyboard based V/Oct creation is not adjusted to exact 1V/Oct, and this is compensated by the expo converter adjustment which is calibrated to work in the opposite direction. Or the input buffer of the external CV does not amplify properl...
by analogmonster
Thu Feb 11, 2016 4:51 am
Forum: Modular Forum
Topic: Specs of an original 905 reverb spring
Replies: 4
Views: 2055

Re: Specs of an original 905 reverb spring

Back when Moog started making these, there weren't a lot of choices for springs. I'm assuming that the springs available back then were all about the same as the units being used in most guitar amps. The typical Fender amp springs back then were usually an 8 ohm input impedance, and a 2.5k ohm outp...
by analogmonster
Wed Feb 10, 2016 5:54 am
Forum: Modular Forum
Topic: Specs of an original 905 reverb spring
Replies: 4
Views: 2055

Specs of an original 905 reverb spring

Hi everyone,

can anybody provide the specs of an original 905 reverb spring, meaning:

- input impedance?
- output impedance?
- input insulation?
- output insulation?
- delay time?

Thanks a lot
by analogmonster
Wed Oct 21, 2015 1:26 am
Forum: Modular Forum
Topic: 921 tempco
Replies: 4
Views: 1088

Re: 921 tempco

Great, thanks, MC.
by analogmonster
Tue Oct 20, 2015 11:23 am
Forum: Modular Forum
Topic: 921 tempco
Replies: 4
Views: 1088

921 tempco

Hi,

which type of tempco is used for the 921 VCO, and how is it mounted?

Thanks
by analogmonster
Wed Oct 07, 2015 7:45 am
Forum: Modular Forum
Topic: Moog Custom Delay Mixer...
Replies: 5
Views: 1278

Re: Moog Custom Delay Mixer...

Schematics anybody? I don't think a schematic would help me here actually...!? In fact, it seems to be a very simple circuit... containing just two of those IC's that are in the 960 sequencer, a few round can-type op amps and not much more. I could, if I was so inclined, draw out the schematic foll...
by analogmonster
Mon Oct 05, 2015 2:35 am
Forum: Modular Forum
Topic: Moog Custom Delay Mixer...
Replies: 5
Views: 1278

Re: Moog Custom Delay Mixer...

Schematics anybody?