AMB Laboratories DIY Audio

[schlaget]

My e12's time delay is 14-15 seconds. In the specs it states it should be about 6 seconds. Why could this be the case? It is connected to +-~29v from the o22.
I got the kit from Glass jar audio, so the parts should be as specs. My only modification was to increase C5 to 3.3uf, but this did not subjectively change time delay.

How could I reduce time delay? standard 6 secs would be ok, but less would be even better, since I don't really need it.

[amb]

Various things affect actual delay time. You can reduce the value of C7 or R11. See the circuit description on the ε12 website schematic page.

[schlaget]

May I ask, what R11 and R13 would be appropriate if I want the e12 to connect as fast as possible (less than 1 sec).

[amb]

You should reduce the value of C7 to less than 1/10 the default value. It won't be exact, but you can give it a try.

[schlaget]

I was afraid I would have to change C7. I have a mass of resistors lying around, but unfortunately no bipolar electrolytic capacitors... Does C7 need to be bipolar?

[amb]

No, C7 can be a standard polarized electrolytic. Just install with its "-" lead connected to the ground pad on the board. It's specified as non-polarized to make ordering easier, because C6 needs to be non-polar and has the same default capacitance.

[schlaget]

Substituted C7 with 10uf polar instead of 100uf bipolar. Works perfectly. About 1-2sec turn on time.
My project is really improving due to these minor modifications.

Thank you so much Ti!

[mikeg88]

Hi,
I've been quietly following this thread in the background, and I tried the alternate approach: reducing R11. Mine started as the recommended value, so I swapped it for a 68.1K that I had in my parts box, and the delay time went down from around 7 sec to about 1.5 sec. Just saying, for the sake of comparison