Adjusticator with Dual Op-amp/2 stages

[chrisaxeman]

Hi There,

Has anyone built R.G's Adjusticator with a TL072 or similar?

I'm trying to build one for an adjustable send return for a delay pedal in a line level loop.

With the original schematic that is based around a single op-amp,I'm not sure about how to configure the network on the positive input and the positive voltage connection in regards to a dual chip.

Do I have to duplicate this network again,or can I just tee-off another 100k resistor into the input of the second half of the op-amp?

Hope I'm making sense.

Thanks in advance.

Chris.......

[R.G.]

Do I have to duplicate this network again,or can I just tee-off another 100k resistor into the input of the second half of the op-amp?

You can just tee off another 100K resistor for the second bias.

[chrisaxeman]

Do I have to duplicate this network again,or can I just tee-off another 100k resistor into the input of the second half of the op-amp?

You can just tee off another 100K resistor for the second bias.

Thankyou R.G!

I'm on my way.......

Cheers

Chris

[Noplasticrobots]

Other than teeing off another 100k resistor for second stage input, can anything else be left out?

[Processaurus]

Just wanted to say this is a great idea, I can't believe there isn't a commercial product like this.  So many musicians will like a pedal, but don't use it because it doesn't have the right EQ or output level.  I was going to try making one sometime with using the 2 band active EQ in the Sansamp GT2.

The Geofex filters look good, though.

If you're interested, a forumite named STM published a lot of interesting stuff on filters, if you search using his user name:

here's one:

http://www.diystompboxes.com/smfforum/index.php?topic=25788.msg172183#msg172183

One could go further with this adjusticator idea and add a compander were the expander was sidechained to the input, for noisy effects, or ones that suffer from lack of headroom, or both.  That would be the ultra deluxe version, for sure.