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Open Discussion / Re: Harbinger (UniVibe) LDRs?
« Last post by LaceSensor on Today at 03:25:53 AM »
Quote from: alanp on April 08, 2020, 10:59:12 PM
A brief google says the suggested LDR is roughly 6M7 dark resistance.

Tayda Waitrony LDRs are 500k dark resistance. You're going to get not a lot of depth.

If you still have any lying around, I'd suggest the Lovetone 20k/20M LDRs used for the ?Flange.

Hey Alan, thanks for the heads up. I managed to grab the datasheet. I have a bunch of LDRs from Futurlec knocking around somewhere, will try and dig them out and see if any would be suitable.
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Open Discussion / Re: what are you guys listening to at the moment?
« Last post by alanp on Today at 12:03:07 AM »


Really, really good, and it feels like a continuation of Alice in Chains, just different, in the same way that AC/DC was different when they went from Bon Scott to Brian Johnson.
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General Questions / Re: Harbinger 1.5 how to wire lamp for bypass ?
« Last post by Prefectingfjords on April 08, 2020, 11:46:20 PM »
Quote from: cooder on April 08, 2020, 01:53:10 PM
I think from the top of my head this question came up before and Brian said that doing so is not really a good idea. The switching on of lamp as you engage effect will give a nasty pop. Overall the life expectancy of the bulb should be not too much a worry to warrant side effects like this.
Someone correct me if I'm wrong on this.


Quote from: madbean on April 08, 2020, 05:31:39 PM
You don't need to do this. The lamps will last for a very long time and are cheap. Buy two and you have enough to cover your whole life, probably.

For comparison sake:
Life cycle for the average electrolytic cap: 1000-2000 hours.
Life cycle for the Univibe lamps: up to 16000 hours.


Cooder and Madbean,

Thanks to you both for quick replies, and for the advice.  I didn’t realize how long those lamps last.  I already ordered a few extra with the rest of the components, but the additional info gives me sufficient peace of mind going into the build.  Really looking forward to it.

Brian, thank you for this site and for your awesome selection of PCBs.  Every one of your builds has turned out great so far, and the build docs are a huge help.
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Open Discussion / Re: Where do you buy kits?
« Last post by rockola on April 08, 2020, 11:25:28 PM »
Quote from: Muadzin on April 08, 2020, 03:08:31 PM
It's slim pickings getting kits in Europe from local suppliers that aren't called MusicDing.
Fuzzdog has plenty of kits. https://shop.pedalparts.co.uk/
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Open Discussion / Re: Harbinger (UniVibe) LDRs?
« Last post by alanp on April 08, 2020, 10:59:12 PM »
A brief google says the suggested LDR is roughly 6M7 dark resistance.

Tayda Waitrony LDRs are 500k dark resistance. You're going to get not a lot of depth.

If you still have any lying around, I'd suggest the Lovetone 20k/20M LDRs used for the ?Flange.
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General Questions / Re: Harbinger 1.5 how to wire lamp for bypass ?
« Last post by madbean on April 08, 2020, 05:31:39 PM »
You don't need to do this. The lamps will last for a very long time and are cheap. Buy two and you have enough to cover your whole life, probably.

For comparison sake:
Life cycle for the average electrolytic cap: 1000-2000 hours.
Life cycle for the Univibe lamps: up to 16000 hours.
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General Questions / Re: Fuzz Face Q1 Gain
« Last post by Aleph Null on April 08, 2020, 04:42:13 PM »
Quote from: WormBoy on April 04, 2020, 06:59:16 AM
Quote from: Aleph Null on March 30, 2020, 05:12:21 PM
The sweet spot for transistor gain is pretty well established for the Fuzz Face circuit and part of the problem with silicon versions of the circuit is that it's difficult to find transistors in that 80-100 or so hfe range.
Well ... if something gets repeated on the internet over and over, that does not make it 'true' ... it does make transistors in a certain gain range difficult to find and expensive ;). I have been playing with some left-over transistors with very low gain on a breadboard FF, and can get some nice sounds out of them. Some people have reported good sounds with high-gain silicons, you may have to tweak some values. So, if you have a set of transistors that are higher or lower gain than traditional wisdom prescribes, I would simply try them and see if you like the sound.

This is one of the few times the accepted wisdom seems to be true, at least where my taste is concerned. I've been happiest with fuzz faces when the transistor set fall in that range.

Having looked further into this since my initial post, I've found that a common solution is to leave Q1 source tied to ground and use potentiometers (Maybe 10k?) in place of the two drain resistors, then adjust to get the desired voltages at the drain (0.7v and 4.5v, respectively). This changes the bias of the transistors changing the effective gain. I'm not sure this would let you use any old transistor, but it seems like it would open up a lot of options.
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Open Discussion / Re: Harbinger (UniVibe) LDRs?
« Last post by LaceSensor on April 08, 2020, 04:36:42 PM »
bueller?
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Build Reports / Re: Coda Effects Black Hole
« Last post by Hexjibber on April 08, 2020, 04:09:25 PM »
Thanks guys, appreciate it!


Sent from my iPhone using Tapatalk
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General Questions / Re: Rotary Switch Question
« Last post by davent on April 08, 2020, 04:03:27 PM »
On the 3P4T switch i have here, A connects to 1 in positions 1,5 & 9. A - 2 connects in position 2, 6 & 10.   A - 3, connects in positions 3, 7 & 11...

A 1 x 12 or 2 x 6 are easy to get and give you your 5 positions.
dave
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