bobbass4k Posted January 16, 2023 Share Posted January 16, 2023 3 minutes ago, Wilson_51_ said: Yeah pins 1 and 8 are connected, I’m unsure if it fully is the charge pump but it’s a siren type sound almost like a flanger noise. Thanks for this! The mouser ones have a £12 postage on them which feels massively steep. If it sounds like a flanger then the frequency is shifting which suggests it's probably not the charge pump, and the boost should take the charge pump noise well out of audible range. Probably worth looking at other culrprits. All mouser stock is held in the US - they do a good job on intl. Shipping but it is still expensive. I edited my response above, farnell have the LTC1144. Delivery is free but there's a £10 handling charge under £24, and a £6 handling charge between £24 and £48. Over £48 is free, so if you wanted to stock up it could be worthwhile. Full disclosure I do work for farnell, please buy components so I can continue to spend my wages on components. 2 2 Quote Link to comment Share on other sites More sharing options...
northcountrybob Posted January 16, 2023 Share Posted January 16, 2023 I've come across this issue with 7660's when trying to do some repairs. The J Rocket Archer uses a 7660S, and I've swapped out a failed one and introduced a HF whistle. The issue I had was caused by accidentally using a 7660 which has nothing connected to pin 1 (so no boost mode, just runs at 10KHz) as opposed to a 7660S with the boost on pin 1. I've had better luck with the LT1054 compared to the 7660S and the 1044. I've replaced a lot of MAX1044's in bogner la granges. Quote Link to comment Share on other sites More sharing options...
Wilson_51_ Posted January 16, 2023 Share Posted January 16, 2023 8 minutes ago, bobbass4k said: If it sounds like a flanger then the frequency is shifting which suggests it's probably not the charge pump, and the boost should take the charge pump noise well out of audible range. Probably worth looking at other culrprits. Thanks for this, I’ll look for what else could be causing this. Apart from this odd noise the rest of the circuit seems to be working. Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted January 16, 2023 Share Posted January 16, 2023 2 minutes ago, Wilson_51_ said: Thanks for this, I’ll look for what else could be causing this. Apart from this odd noise the rest of the circuit seems to be working. Tried another power supply? Quote Link to comment Share on other sites More sharing options...
tauzero Posted January 16, 2023 Share Posted January 16, 2023 32 minutes ago, Wilson_51_ said: Thanks for this! The mouser ones have a £12 postage on them which feels massively steep. The Ebay one from China came to about £8 total, so it depends how patient you feel like being. Quote Link to comment Share on other sites More sharing options...
Wilson_51_ Posted January 16, 2023 Share Posted January 16, 2023 1 minute ago, LukeFRC said: Tried another power supply? I’m gonna try it with battery tonight to see if it’s a power supply issue. I’ve been running it through a cioks dc5. Quote Link to comment Share on other sites More sharing options...
tauzero Posted January 16, 2023 Share Posted January 16, 2023 42 minutes ago, bobbass4k said: Are you using the 7660s in boost mode (pins 1 and 8 connected)? Also the LTC1144 is available at farnell (search 4029296) - they are expensive though. I searched CPC Farnell for LTC1144 and couldn't find it, then I tried searching with that part number and also couldn't find it. Are you going via the website or the internal stock system? Quote Link to comment Share on other sites More sharing options...
nekomatic Posted January 16, 2023 Share Posted January 16, 2023 CPC is part of Farnell but their catalogues aren’t the same. 1 Quote Link to comment Share on other sites More sharing options...
bobbass4k Posted January 16, 2023 Share Posted January 16, 2023 22 minutes ago, tauzero said: I searched CPC Farnell for LTC1144 and couldn't find it, then I tried searching with that part number and also couldn't find it. Are you going via the website or the internal stock system? That was on the website on my phone. As neko says, CPC are for all intents and purposes a different company - especially on components they don't stock nearly the range we do, as it's not big business for them. Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted January 16, 2023 Share Posted January 16, 2023 38 minutes ago, bobbass4k said: That was on the website on my phone. As neko says, CPC are for all intents and purposes a different company - especially on components they don't stock nearly the range we do, as it's not big business for them. I must say it confuses me - CPC seem more aimed at b2c and the Farnell are more b2b? Quote Link to comment Share on other sites More sharing options...
bobbass4k Posted January 16, 2023 Share Posted January 16, 2023 20 minutes ago, LukeFRC said: I must say it confuses me - CPC seem more aimed at b2c and the Farnell are more b2b? Basically yeah - farnell is aimed at design engineers, small volume manufacturing, repair/servicing etc. and the main focus is on board level components. CPC is aimed at anyone with money and is focussed much more on businesses, trade and normal consumers. Basically they sell plant pots, and we do not. 1 1 Quote Link to comment Share on other sites More sharing options...
Wilson_51_ Posted January 17, 2023 Share Posted January 17, 2023 Possibly, maybe, could have potentially fixed the issue. I rewired all the off board wiring. I think it may have been a ground issue. It didn’t make the noise when I just tried it but will box it back up and test it properly. 1 Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted January 18, 2023 Share Posted January 18, 2023 My low tide mini works. I’m very excited. 2 Quote Link to comment Share on other sites More sharing options...
bobbass4k Posted January 18, 2023 Share Posted January 18, 2023 1 hour ago, LukeFRC said: My low tide mini works. I’m very excited. Be mindful that it needs to be calibrated very carefully. I say that because PedalPCBs documentation for his $30 PCB doesn't mention it at all..... He makes good boards and I get that his focus is on tracing and pumping out new boards, but the lack of information makes them risky investments. He claims it's just a manpower/time issue, but it is interesting how many of the boards without schematics published are the unique and exciting ones that he's traced himself, like the low tide... Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted January 19, 2023 Share Posted January 19, 2023 7 hours ago, bobbass4k said: Be mindful that it needs to be calibrated very carefully. I say that because PedalPCBs documentation for his $30 PCB doesn't mention it at all..... He makes good boards and I get that his focus is on tracing and pumping out new boards, but the lack of information makes them risky investments. He claims it's just a manpower/time issue, but it is interesting how many of the boards without schematics published are the unique and exciting ones that he's traced himself, like the low tide... I wasn’t expecting it to work and then stayed up far too late sorting the calibration. The daft thing is about PedalPCB that the forum seems to have most the info on it, including schematic - https://docs.pedalpcb.com/project/LowTide-Schematic-PedalPCB.pdf but you have to root around to find things - one post on one thread - LDSS needs for the barbershop, another post is someone telling you how to bias it… another is… it’s not beginner friendly Quote Link to comment Share on other sites More sharing options...
rmorris Posted January 19, 2023 Share Posted January 19, 2023 On 06/01/2023 at 18:19, LukeFRC said: Random question- what are the 2m resistors doing here? One I think is to stop a pop on switch on? Other set input impedance? should if work without them? Yes, R1 allows C1 to discharge to 0V to minimise pops on plugging in. R3 biases the Gate of Q1 to 0Vdc. The input Z is essentially 2M inn parallel with 2.033M. In round numbers = 1M Quote Link to comment Share on other sites More sharing options...
rmorris Posted January 19, 2023 Share Posted January 19, 2023 On 06/01/2023 at 15:15, Smanth said: I feel you! The "Big Boys Race Our ..." mnemonic is etched in my head since my early exploits with breadboards, a cheap and nasty soldering iron and a stack of Babani books ... but these days (as you) I just bung a multimeter on them ... it has the secondary advantage of allowing me to pick one from the strip that is closest to the nominal value. S'manth x Confession - I'm an electronics design engineer and never read resistor codes - just measure them. And of course SMT resistors have the value marked on them in some form. 2 Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted January 19, 2023 Share Posted January 19, 2023 24 minutes ago, rmorris said: And of course SMT resistors have the value marked on them in some form. Surface mount is easier, assuming good optics - instead of the colour they have a number on them like 103 or 472 Quote Link to comment Share on other sites More sharing options...
bobbass4k Posted January 19, 2023 Share Posted January 19, 2023 4 hours ago, LukeFRC said: I wasn’t expecting it to work and then stayed up far too late sorting the calibration. The daft thing is about PedalPCB that the forum seems to have most the info on it, including schematic - https://docs.pedalpcb.com/project/LowTide-Schematic-PedalPCB.pdf but you have to root around to find things - one post on one thread - LDSS needs for the barbershop, another post is someone telling you how to bias it… another is… it’s not beginner friendly Yeah, I basically had to beg for that low tide schematic - claims it's not included in the build doc because it's visually very large, but... Split it over 2 pages? Include it as is and let people zoom? Include a link to it hosted somewhere? I guess he makes no claim to being beginner friendly, and if you know what you're doing his boards are very usable, and the forum's do a great job of plugging the gap, but I do wish he'd just be honest about why the schematics are so scarce. Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted January 19, 2023 Share Posted January 19, 2023 On 06/01/2023 at 12:42, Woodinblack said: I must admit in all my years of working both as hobby electronics and later as an electronic engineer (which I guess counts for about 20+), I have been liucky enough to never has found a resistor with the wrong values on it. Some are harder to see than others, but never wrong. Capacitors on the other hand... It's well worth getting a cheap component tester kit off t'interweb. LCR and transistors (FET and bipolar). So useful! Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted January 19, 2023 Share Posted January 19, 2023 1 hour ago, Stub Mandrel said: It's well worth getting a cheap component tester kit off t'interweb. LCR and transistors (FET and bipolar). So useful! It is - I have a few. I was just saying if there is something to not trust the value is printed wrong, it is a capacitor, mostly because everyone labels them their own way, unlike resistors Quote Link to comment Share on other sites More sharing options...
tauzero Posted January 19, 2023 Share Posted January 19, 2023 1 hour ago, Stub Mandrel said: It's well worth getting a cheap component tester kit off t'interweb. LCR and transistors (FET and bipolar). So useful! You can get one with an oscilloscope included for fifty quid. https://manuals.plus/fnds/dso-tc2-oscilloscope-transistor-tester-manual Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted January 19, 2023 Share Posted January 19, 2023 3 hours ago, bobbass4k said: Yeah, I basically had to beg for that low tide schematic - claims it's not included in the build doc because it's visually very large, but... Split it over 2 pages? Include it as is and let people zoom? Include a link to it hosted somewhere? I guess he makes no claim to being beginner friendly, and if you know what you're doing his boards are very usable, and the forum's do a great job of plugging the gap, but I do wish he'd just be honest about why the schematics are so scarce. it's kinda a slight detour away from the freestompboxes open source tracing of things Quote Link to comment Share on other sites More sharing options...
disssa Posted January 22, 2023 Share Posted January 22, 2023 A mix between Vong by schalltechnik 04 and Broughton Hi/Lo PassFilter: 3 Quote Link to comment Share on other sites More sharing options...
DaleASmith Posted January 27, 2023 Share Posted January 27, 2023 On 23/08/2022 at 18:05, disssa said: JPTR FX Jive Clone: Looks great..How does it sound? Any demo's?? Quote Link to comment Share on other sites More sharing options...
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