A question about 2n3904's please. So many circuits call for this transistor... I'm increasingly finding the each time I buy them the HFEs seem to be getting lower and lower (I received some today in the low 80s and none higher than 200)
It was my belief this was a relatively high hfe transistor? What are people's thoughts and is it important in a circuit like this?
Thats very low mate, they usually come in at around 250 but I wouldn't worry too much about it. I've made some great fuzz pedals using silicon trannies with an hfe of around 80
Just finished this and now testing it. I get signal through it, Vol works as does tone, but when adusting more I get pretty much no dirt? I used a BAT48 instead of 41 as it was what I had on hand, could that cause the problem? Also used some D9J's as thats what I had, diodes are socketed so I can change things around if needed.
From what I recall, this circuit has a decent amount of dirt. Kind of a supercharged Electra. Sounds like you might have a bridge or a misplaced component. Speaking of EQD and Electra, I’ve always liked The Bellows personally. Oldie but a goodie.
Thats what I thought also, I'll have to double check everything tomorrow. I don't think its a misplaced component as I'm always super careful after doing that in the past! But you never know. A bridge is more likely I think.
I had a feeling this was going to show up any minute. Thank you! Now I'm going to be a big nerd and go find myself some D9Ks.
ReplyDeleteOh man!!!!
ReplyDeletewelp, had to build this one immediately 😂 tag it, sir!
ReplyDeleteSoooo fast o.O!
DeleteThanks man, it is now tagged.
This comment has been removed by the author.
ReplyDeleteThank you Anders!!!!
ReplyDeletehttps://youtu.be/arupw3BS7Go
https://photos.app.goo.gl/MUzCH2tLyr1yxA3e9
ReplyDelete10m resistor in the collector-base of q1?! wowza! I can only find these in carbon 1/2watt format, does this seem about right?
ReplyDeletenm, found the metal film versions!
DeleteA question about 2n3904's please.
ReplyDeleteSo many circuits call for this transistor... I'm increasingly finding the each time I buy them the HFEs seem to be getting lower and lower (I received some today in the low 80s and none higher than 200)
It was my belief this was a relatively high hfe transistor?
What are people's thoughts and is it important in a circuit like this?
Ian
Thats very low mate, they usually come in at around 250 but I wouldn't worry too much about it. I've made some great fuzz pedals using silicon trannies with an hfe of around 80
DeleteThank you👍
DeleteJust finished this and now testing it. I get signal through it, Vol works as does tone, but when adusting more I get pretty much no dirt?
ReplyDeleteI used a BAT48 instead of 41 as it was what I had on hand, could that cause the problem? Also used some D9J's as thats what I had, diodes are socketed so I can change things around if needed.
From what I recall, this circuit has a decent amount of dirt. Kind of a supercharged Electra. Sounds like you might have a bridge or a misplaced component. Speaking of EQD and Electra, I’ve always liked The Bellows personally. Oldie but a goodie.
DeleteThats what I thought also, I'll have to double check everything tomorrow. I don't think its a misplaced component as I'm always super careful after doing that in the past! But you never know.
DeleteA bridge is more likely I think.
My mistake, Bellows is a Bazz Fussss. Cool simple beginner circuit if someone is looking for one.
Delete