Easy face-problem
Hi guys!!!! First of all congrats to everyone for contributing to an amazing forum for DIYers and musicians. Let's move on to my question. I have recently built and Easyface. The problem with is that I get a nice fuzzy sound but it is way too low volume...My ac128 transistor is about hfe81-90 accornding to the store i got it. Is it too low gain or is it something else? Here's the layout I used:
https://img593.imageshack.us/f/easyface.gif/
Thanks!
Makis
https://img593.imageshack.us/f/easyface.gif/
Thanks!
Makis
- lolbou
- Old Solderhand
You mean both?makispoll wrote:My ac128 transistor is about hfe81-90
Which store? Better off checking these yourself with GEOFEX method...makispoll wrote:accornding to the store i got it
Did you tweak the trimpot somehow?
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
- Uh, no, I'm a mocker.
Thanks for your reply. I bought them from Banzai. The Ge transistor has hfe 81-90 no idea how much is the Si. This easyface is a hybrid of Ge-Si transistors. I also checked and swapped them and turned them upside down. I tweaked the tripod and it's set at maximum in order to get that wee sound. What do you think is the best hfe value of the transistors in order to get it sound properly? Do you think that low hfe gives low volume or low gain or....both?
I have ordered some alternative Ge transistors. I will try those when they arrive... If there will be no improvement will try with a multimeter. As for they layout do you think there is something wrong in terms of values or connections? I compered it to the schematic and to me it looks ok but I'm not that experienced.
- mictester
- Old Solderhand
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The gains of the transistors will not affect the output level - it just changes the amount of fuzziness. Change the 470 ohm resistor for 1k and you'll get much more level out, but you'll have to adjust the trimmer again to get rid of any "gating".makispoll wrote:Hi guys!!!! First of all congrats to everyone for contributing to an amazing forum for DIYers and musicians. Let's move on to my question. I have recently built and Easyface. The problem with is that I get a nice fuzzy sound but it is way too low volume...My ac128 transistor is about hfe81-90 accornding to the store i got it. Is it too low gain or is it something else? Here's the layout I used:
https://img593.imageshack.us/f/easyface.gif/
Thanks!
Makis
"Why is it humming?" "Because it doesn't know the words!"
- DrNomis
- Old Solderhand
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I've even substituted a 4.7K resistor for the 470 Ohm to give lots of output....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
DrNomis wrote:I've even substituted a 4.7K resistor for the 470 Ohm to give lots of output....
4k7? That's 10times more resistance! Did you use the same schematic as me apart from the 4k7-470R swap? Did you face the same low level problem initially?
SORTED!!!! Thanks everyone for your help!!! The problem was different though.....
I inspected the traces and cleaned them and discovered a tinny "hair" thick solder connecting two copper stripes . That little think caused everything. So no need for changing resistors it works great with those values!!!!! I can confirm that with a 2N2907A for Q1 and AC128 hfe 81-90 for Q2 the pedal sounds great!!! It definitely worths building it!!!!
I inspected the traces and cleaned them and discovered a tinny "hair" thick solder connecting two copper stripes . That little think caused everything. So no need for changing resistors it works great with those values!!!!! I can confirm that with a 2N2907A for Q1 and AC128 hfe 81-90 for Q2 the pedal sounds great!!! It definitely worths building it!!!!