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#1
Building your own stompbox / Re: Testing a Coolaudio V3205
Last post by ElectricDruid - Today at 04:46:23 PMYou need the correct bias voltage on the BBD input, and you need resistors on the BBD outputs (pull downs/ups, can't remember which).
It definitely won't work without the correct input bias. The output, I'm not sure, but the "minimal circuit" for a BBD and the "datasheet circuit" are basically the same thing - there's *nothing* there you can really leave out.
It definitely won't work without the correct input bias. The output, I'm not sure, but the "minimal circuit" for a BBD and the "datasheet circuit" are basically the same thing - there's *nothing* there you can really leave out.
#2
Building your own stompbox / Re: CMOS Inverters: Lowering t...
Last post by PRR - Today at 04:45:32 PMQuote from: edvard on Today at 02:57:46 AMdoes not increase the gain... it lowers the headrooom.
What is the difference?
#3
Building your own stompbox / Testing a Coolaudio V3205
Last post by Ksander - Today at 04:12:32 PMI was given a couple of 3205 BBDs, which were ordered on AliExpress. To test whether they work:
- I programmed an Attiny85 to generate complementary square waves of 10-100kHz, to use as clock signals, and
- I use a voltage divider (10k potmeter as variable resistor + 100k fixed resistor) to get a 14/15th V_{GG}.
- 5v V_{DD} for both the Attiny and 3205 comes from a 78L05
As audio input, I feed the V3205 a guitar signal, buffered using a tl072. The clock signals look clean on an oscilloscope and the buffer output fed to an amplifier directly also sounds fine. The 3205 however produces no output other than some noise.
Is the test setup flawed, or can I conclude that the 3205 doesn't work?
Given that they are from AliExpress, i don't trust them, but I'd like to make sure.
- I programmed an Attiny85 to generate complementary square waves of 10-100kHz, to use as clock signals, and
- I use a voltage divider (10k potmeter as variable resistor + 100k fixed resistor) to get a 14/15th V_{GG}.
- 5v V_{DD} for both the Attiny and 3205 comes from a 78L05
As audio input, I feed the V3205 a guitar signal, buffered using a tl072. The clock signals look clean on an oscilloscope and the buffer output fed to an amplifier directly also sounds fine. The 3205 however produces no output other than some noise.
Is the test setup flawed, or can I conclude that the 3205 doesn't work?
Given that they are from AliExpress, i don't trust them, but I'd like to make sure.
#4
Building your own stompbox / Re: Guitar with Internal Fuzz
Last post by Box_Stuffer - Today at 02:29:06 PMQuote from: Matthew Sanford on Today at 12:48:38 PMQuote from: Box_Stuffer on Yesterday at 10:06:56 PM.Seems strange to leave power on if fuzz isn't used... but you have 2 holes, so... I would think A, but if you want volume control before the fuzz then B makes sense. Can you fit mini DPDT switches in? I'd think one side to switch fuzz out or clean to output (whichever way you wire it) and other side to cut power when fuzz is off, maybe other switch to put a cap on for tone control instead?
My question is, should I
A) make the switch go to the input of the fuzz circuit with the output from the 100k pot hard wired to the output jack?
OR
B) hard wire the input of the fuzz circuit to the output of the volume pot and have the 100k output go to the switch?
Here is a pic of my little fuzz board. Yes - one of the toggles is the power on/off. My main dilemma is how to route the signals with the one other switch. I'm just not sure if it is better to split off from the clean signal at the input, or have the output of the effect hard wired to the output jack. And also if there is anything extra I need to do in either case.
#6
Building your own stompbox / Re: Guitar with Internal Fuzz
Last post by Box_Stuffer - Today at 01:43:24 PMQuote from: Mark Hammer on Today at 12:35:44 PMI take it THAT's the module from this guitar, and not a pre-existing pic of a Black Ice module?
Yes. This is everything I pulled out except for the 2 pots. I didn't take a picture before I disassembled it.
It doesn't look like any Black Ice module I have seen.
#7
Building your own stompbox / Re: How to Calculate Transisto...
Last post by mac - Today at 01:02:52 PMIn retrospect, no superposition of Qubits can beat RG test, a sheet of paper, a pencil and a green display fx Casio 
mac
mac
#8
Building your own stompbox / Re: Guitar with Internal Fuzz
Last post by Matthew Sanford - Today at 12:48:38 PMQuote from: Box_Stuffer on Yesterday at 10:06:56 PM.Seems strange to leave power on if fuzz isn't used... but you have 2 holes, so... I would think A, but if you want volume control before the fuzz then B makes sense. Can you fit mini DPDT switches in? I'd think one side to switch fuzz out or clean to output (whichever way you wire it) and other side to cut power when fuzz is off, maybe other switch to put a cap on for tone control instead?
My question is, should I
A) make the switch go to the input of the fuzz circuit with the output from the 100k pot hard wired to the output jack?
OR
B) hard wire the input of the fuzz circuit to the output of the volume pot and have the 100k output go to the switch?
#9
Building your own stompbox / Re: Guitar with Internal Fuzz
Last post by Mark Hammer - Today at 12:35:44 PMI take it THAT's the module from this guitar, and not a pre-existing pic of a Black Ice module?
#10
