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Messages - SirEgno

#1
Usually I do this with small fragile glass housing diodes. I use a little screwdriver as guide, and wind the leads on it.

They take more space, but I'm no longer a diode destroyer!
#2
General Questions / Re: Need help with zener diode
October 04, 2020, 06:07:31 PM
Got it. the zener is not the best solution, better a 7815 and "passa la paura".
BUT... I have only one 7815 and it doesn't work. It became hot and in output I measure 0.peanuts volts.

#3
General Questions / Re: Need help with zener diode
October 02, 2020, 09:45:12 PM
I don't remember the source, but I read that the 5817 should act as a resistor.
in fact the DMM shows about 50 ohms. Is it not correct?

I've seen this schematic used in many project. That's why I omitted the CLR.
#4
General Questions / Re: Need help with zener diode
October 02, 2020, 06:48:39 PM
I bought them from musikding.
Is there a way to test a zener diode?
#5
General Questions / Need help with zener diode
October 02, 2020, 06:58:23 AM
Hi all,
I'm building a preamp pedal based on sunn O))) beta bass.
My idea is to use different input voltage (9 or 18v), so I'm planning to use this schematic as "power section":


I tested the circuit without any chip, and with 18v input the DMM shows 17,8 volts.
Am I doing something wrong?
#6
Open Discussion / Re: Amp ohm mismatch
August 27, 2020, 12:54:23 PM
The rule is different for tube amp (or with output transformer in general) or solid state (or OTL - output transformer less):

1.Tube/OT - impedante must be the same for head and cabinet;
2.SS/OTL - the cabinet impedance must be same or higher than the head impedance.
#7
Build Reports / Re: Coda Effects Black Hole
June 17, 2020, 06:43:20 AM
Looking at the original schematic the 4th triode is (I don't know the correct word here... biased?) at the same way. 100k resistor on the cathode. maybe it's a coincidence...
My question is about the "anode" trimmers. is 20k enough? I've alway seen 100k trimmers on fet drain.

Now the real important thing. This build is awesome! The graphic gives a 3d look at the pedal.
#8
I use the afterlife in my pedalboard as effect. It's compact ad do the job.
#9
Build Reports / Re: MEAT (snack shack)
June 06, 2020, 08:02:49 AM
Very nice. I like the shocking pink.
I have a bike of this color.
#10
So, 24*2.8=67.2. That's why I also bought a 48v zener diode.

The schematic attached should be fine. But I think I have to add a resistor on the red circle. right?

Thank you very much for helping me!
#11
Open Discussion / Re: What I was thinking?
May 28, 2020, 06:43:40 PM
you're right!
my knowledge is regressing  :-\
Are there some advantages using a full bridge rectifier?
like this:


Doubling the voltage the current is halved, right? the transformer is 0,5VA (2x0,25). so the current should be about 20mA?
#12
some years ago I started to build a mic preamp with phantom power supply.
I bought a 2x15v transformer as main power and for the phantom a... 2x12v transformer.
What strange drugs did I take to get this idea? How can I get 48v from 2x12v transformer?

I bought also every component to build this project and there is no charge pump or something similar.
Only a 48v zener diode.
#13
You could try these steps.
-Check the value of T1.
-Remove all chips except the charge pump, then check the voltage.
-If you can try another 1054.
-check solder join on the -15v trace.
#14
this is what I was talking about:

and this is how it sounds:
https://www.youtube.com/watch?v=4_j0lhKfSz4
The switch is on C8, changes between 33n and 100n.

#15
I don't like overdrive with blend, instead you could use a cap in series with the clipping diodes and a potentiometer as variable resistor.
In a tube screamer I used 47n cap and a 50kB pot.

Better for me is a SHO with hard clipping stage and same capacitor/pot solution. (and also a volume pot).