hi all!

can i use mc14049ubcp as replacement for cd4049ube on dists?

thanks!

Hi,

In a circuit where the opamp is set up to induce distortion (ie the Rat), what would the effect of decreasing the BIAS-R to the Vref pin of the opamp be, as opposed to simply increasing the voltage to the whole circuit? I ask because I'm working on a Rat build, which I've found I particularly like the sound of at 18V (a noticeable loss of 'sag'), and I'm wondering if the same effect could be achieved through simply changing the bias of the LM308. I'm aware that the opamp takes the full...

Hi guys ..... zero experience here but learning, so based on the collective experience, are there modern, suitable replacement components for:

1. LM741p
2. NJM3404AL
3. CA3240EZ

... and a better question is how do you determine what are acceptible replacements? thanks

hey everyone this is my first post..
I've been getting into building pretty quickly (for around six months or so) and I've come across some strange IC's.
I'd really appreciate some input regarding any possible uses for these things.

x2 555d jrc (i'm assuming its a 555 timer)
x2 741d jrc (op amp right?)
x2 UA741cp (same thing or similar?)

these are the ones i can't seem to find much about.
LM565cn-14 pin (phase locked loop?)
DAC-08cn-16 pin (8-bit high-speed multiplying D/A converter?)...

Can anybody help me with this? I've always wondered how. I love the coloration it adds, and would love to implement it!

thanks!

what's the difference between the two for an ic like the lm386 or the lm4562?

Okay, what effect would ramp + hold be?

Anything like a glide control?

Oh, and anytime I see a multiplexer circuit in a datasheet, to us its an octaver, yes? I know you can tune the output freq.

If I cut these sockets I have that are to large into 14 and 8 pin sockets will they work? Is each socket pin separate from the other, or are they all connected?

Is there an article somewhere on the basics of the CD4013 and octaver circuits?

They're 2 different effects from 2 different guys, pick one. They'll sound almost the same.
The Landgraff D.OD. is the 2SC1815/JRC4558, that schematic is drawn by Jones but not designed by him. The Clay Jones OD is the BC546B/OPA2134, it was 'designed' by Jones and the schematic drawn by Soulsonic (The Illuminist).
Me, I'd probably try the CJOD, mostly for bragging rights. Want to make it better? Try metal film resistors.

Anyone have a good suggestion? I'm thinking about a design for a 24v buffer, as an experiment. I was hoping for a recommendation for an appropriate or interesting ic/opamp.

Hi, i just got offered a batch of 50 UA308TC´s for 10 dlls. Is this the same chip as the LM308 found commonly in RAT´s?

I have a bunch of MC1747 OpAmps; some are marked MC1747CG, some are MC1747CL
Both are Motorola, CG's are 10 pin cans and the CL's are 14 pin ICs.

Not sure what these would be good for; anybody got any suggestions?

Hopefully this isn't a dumb question, what's the difference between the LC and CD version of 4069UB?

hey all,
Tricky question, that i bet there won't be a straight answer to, but all the articles i have about designing your own effects all seem to work off opamps. Is there any way to replace the opamp with a transistor? i have a feeling it's not going to be a simple swap over, but is there a way to replace an opamp with one or two transistors? preferably in a situation where i can swap about the transistors to whichever flavour i like.
cheers,
tm

Hi there,

As I can't find SAD1024 IC's anywhere, and when I find them, they are really expensive, and also due to their nature of failing after a certain time, I wanted to know if there is an easy way to put a MN3007 on the place of any SAD1024.
Well, I have seen people substitute it a couple of times (an old Electro Harmonix Small Clone schem, if I am not wrong, and the folks at Moosapotamus, on their A/DA Flanger), but I wanted to know if there are any other circuit changes necessary for...

Hey all,

Looking at building something that needs a TL072; a LOW NOISE J-FET DUAL OPERATIONAL AMPLIFIER , but, unfortunately, both Maplin and Peats were out of TL072. Taking a gamble, and carefuly looking at pinouts, i decided to chance my arm, and pickup TWO TL071's; LOW NOISE J-FET SINGLE OPERATIONAL AMPLIFIERS . My question is simple, can i use two TL071's instead of a single TL072? Pinouts aren't a problem, it's fairly obvious as to what to do like, but is there any reason as to why i...

is it just delay times? Could I swap these in my boss flanger to see what happens?

I just picked up a metal can LM108 from a local electronics shop. They informed me that the LM108 was just the military spec LM308.

I was wondering if I could use the LM108 and expect to get the classic rat tone,
or if the higher tolerance of the LM308's contributed to the sound of the rat?

Thanks!!

Hello all, this is my first post...so please be gentle. I am a complete bona fide newbie at pedal building - nothing more complicated than A/B boxes and guitar rewiring at present. My question may seem very basic but here it is: How does one decide which IC chip/ OP amp to use???? Is there any info anywhere that can offer any info on specific characteristics of different chips and their suitability for various apps?....Im going to be getting my feet wet with a simple boost and progress from...

So... what would be the max. delay time (theoretical, not necessarily using the part values shown) if you used a PWM frequency of 20kHz?

I have a couple units that I want to RE and a couple IC chips have been sanded down to avoid this sort of thing.
What options are there for figuring this sort of thing out?

So I have another question. It's been snowing and raining here in Colorado for almost 2 weeks straight, and there hasn't been much for my jobless self to do but think and think and think.

...And I've got some REALLY cool ideas. :horsey:

But what I'm asking here probably isn't that cool, or new.

I read somewhere once that IC's in IC based overdrive circuits don't like bass freq's being fed into them, so a big part of the circuit is stripping freq's and adding them later right? Well, I don't...