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 Forum index » DIY Hardware and Software
the Moon Base Xplorer
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beepetc.



Joined: Mar 07, 2018
Posts: 6
Location: Denmark

PostPosted: Wed Aug 01, 2018 10:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Okay, it works now!
I've changed the 1n4148's to LED's, which seemed to make the major difference (as well as giving visual feedback to the individual stages (uuuh, blinkenlights!)) . I've also changed the output capacitor from 10uF to 1uF, as well as changing the value of the resistor connecting 9V to reset on the 555 timer, from 100K to 47K.
I'm not always sure what I'm doing, but I feel like it's going in the right direction!

THANKS! Very Happy Very Happy Very Happy
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PHOBoS



Joined: Jan 14, 2010
Posts: 5370
Location: Moon Base
Audio files: 699

PostPosted: Fri Aug 03, 2018 1:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great Very Happy
Haven't tried it with LEDs myself but I guess because of the higher forward voltage the maximum voltage
to which the caps gets charged will be lower, not sure why that works for you but hey if it works Laughing

Quote:
I'm not always sure what I'm doing, but I feel like it's going in the right direction!

heh, I am familiar with that.

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beepetc.



Joined: Mar 07, 2018
Posts: 6
Location: Denmark

PostPosted: Sat Aug 04, 2018 5:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Is the transistor after the two pots working as a buffer? My friend removed it, and connected to EG out directly to the base of the VCA transistor, which works for him. We're getting different results with the same components. Confused It's super strange. When I have the 100k resistor from reset to VCC, the EG is sustained infinitely. When I remove it, it works like a charm.

This is my version of the schematic.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

This is his (prettier) version.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

All unused input pins have been tied to ground, for good measure.

Edit. The VCA sounds clearer with the buffer transistor and has a longer release time. Without it, the signal gets dirtier, as well as a more nasal character.
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Just Say Noise!



Joined: Nov 14, 2011
Posts: 17
Location: Portland, Oregon

PostPosted: Wed Dec 01, 2021 12:02 pm    Post subject: Re: The Moon Base Xplorer
Subject description: AD/AR generator
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PHOBoS wrote:
To make sure the voltage doesn't
rise above 10V (in AR mode) I added a zenerdiode.



AD/AR question here. What 10V diode is used on the threshold/pin 6? I'm a bit confused by the "10V" diode name. Forgive me, I'm a little green about diodes. I'm familiar with the 0.7v drop across diodes etc, but sometimes I see schematics naming the diodes as 3v3 for example, or 10v. What is that referring to? Is it the PIV (peak inverse or reverse voltage rating), VRRM (max repetitive reverse voltage) or the VR (max DC reverse voltage) or something else altogether?

Thanks for any insight!


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PHOBoS



Joined: Jan 14, 2010
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Location: Moon Base
Audio files: 699

PostPosted: Wed Dec 01, 2021 1:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's a zener diode which unlike a regular diode is made to break down at a specific voltage (not break it as in destroy it).
In this case it's a 10V zenerdiode which means that when the voltage over it gets to 10V it starts to break down and conduct
in the opposite direction aswell. This will limit the maximum voltage over the capacitor in AR mode. Without it the voltage
would keep rising to pretty much the supply voltage which is higher then it gets in AD mode.

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Just Say Noise!



Joined: Nov 14, 2011
Posts: 17
Location: Portland, Oregon

PostPosted: Wed Dec 01, 2021 2:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for explaining that PHOBoS! I was getting confused at all the different specifications for diodes when trying to source it. So its the "Nominal Zener Voltage" or "Vz" that you are referencing. looks like a 1N4740A, according to datasheet, has a VZ of 10v, so that should work. Great little envelope generator. Thanks for sharing it!
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PHOBoS



Joined: Jan 14, 2010
Posts: 5370
Location: Moon Base
Audio files: 699

PostPosted: Thu Dec 02, 2021 12:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Besides breakdown voltage the power rating can be of some importance. Not because too much current can destroy it,
though that is of course also important, but for it to properly do its zener thing there has to be a minimum amount of current
flowing through it. I believe this minimum current increases with a higher power rating. I usually use 0.5W zeners or
whatever is available but I think for this application the 1N4740A (1W) would probably work fine aswell.

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