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Help with Analog Delay Circuit
Help with Analog Delay Circuit
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Old 17th April 2018, 10:42 PM   #11
eurekaiv is offline eurekaiv  United States
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Join Date: Dec 2009
Quote:
Originally Posted by voltwide View Post
There is not much you can do about that except cutting high frequencies using a low pass.
I attempted to do this but my implementation was incorrect... put a basic resistor cap network at the output and the volume dropped dramatically and it seemed as though my 6khz filter (based on the calculator) was closer to 600 hz. I'd love to try this mod so if you have any suggestions for ways to implement this I'm all ears.
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Old 18th April 2018, 08:54 PM   #12
voltwide is offline voltwide  Ireland
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Join Date: Jan 2010
Quote:
Originally Posted by eurekaiv View Post
I attempted to do this but my implementation was incorrect... put a basic resistor cap network at the output and the volume dropped dramatically and it seemed as though my 6khz filter (based on the calculator) was closer to 600 hz. I'd love to try this mod so if you have any suggestions for ways to implement this I'm all ears.
In case you add the echo to the dry signal as an effekt, there is no point in designing the echo path with full audio bandwidth. You may cut high frequencies above 2..3khz.

This is not true if you want to delay the full audio signal, but in that case you end at the limitations of that antique BBD technique.

You can build a cheaper and even better analog delay using PT2399.
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Old 20th April 2018, 05:53 PM   #13
Gnobuddy is offline Gnobuddy  Canada
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Join Date: Mar 2016
Quote:
Originally Posted by eurekaiv View Post
Unfortunately, the audio signal in/out seems different from that of a guitar as all I got was a very faint audio.
I know nothing at all about pinball machines, but if all you need is a stronger signal to feed to a guitar delay pedal, why not build a simple transistor gain stage to insert ahead of the pedal? (And a pot on the output to bring the signal level back down.)

Since this isn't exactly a Hi-Fi situation, and you don't have to have high imput impedance, a single transistor, three resistors, and a couple of small capacitors will probably do all you need. That seems a lot simpler than trying to re-invent an analogue delay using a chip as rare as a pregnant Dodo.

-Gnobuddy
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