Yeah, LTC1144 for is a charge pump and it is an expensive one! You can sub it with MAX1144 or ICL7660S. Just bear in mind that LTC1144 has a maximum input voltage at 18v while ICL7660S is at 12v and MAX1144 is 10v. The latter ones will be fried if you exceed it. For the odd resistor values, I'm pretty sure you can sub them for the closest common value. 12,4k to 12k, 392k to 390k and 532ohm to 510 or 560 ohm. Not sure why some builders use these odd values...partly to mess with people like us?
You can tag this one. BUild it, with the LTC1144 (hard to find)... I'm loving it. On the box now. But I'm gonna work it a bit to get more level. 18v a must. Thanks a mil.
AS I was looking for more volume, checking the schematic, I found some issues where I need your advice: Correct me if I'm wrong, please: I suspect there's a 10uF electrolite missing between OPA2134 pin 4 and ground (parallel with 100nF cap). Should'n't be a cut in G10? Thanks in advance!
Hi there! For the suggested cut at G10. Pin 5 of IC3 generates the -9v power supply that needs to be connected to both pins 4 of the TL072 and OPA2134. A cut would cut the oout negative power supply from the OPA2134 so I'm afraid that isn't the culprit for the low output. Same with the missing 10uf cap. It is essentally another power filter cap at the negative power supply rail along with a 100uF and 100nF ceramic. It is a bit overkill but I'll try to squeeze it in.
Tempting... until I see all the odd values... IC3 is a charge pump, right? Are there any common substitutes like a MAX1044 and ICL7660, or LT1054?
ReplyDeleteYeah, LTC1144 for is a charge pump and it is an expensive one! You can sub it with MAX1144 or ICL7660S. Just bear in mind that LTC1144 has a maximum input voltage at 18v while ICL7660S is at 12v and MAX1144 is 10v. The latter ones will be fried if you exceed it.
ReplyDeleteFor the odd resistor values, I'm pretty sure you can sub them for the closest common value. 12,4k to 12k, 392k to 390k and 532ohm to 510 or 560 ohm. Not sure why some builders use these odd values...partly to mess with people like us?
You can tag this one. BUild it, with the LTC1144 (hard to find)... I'm loving it. On the box now. But I'm gonna work it a bit to get more level. 18v a must.
ReplyDeleteThanks a mil.
Dragão
Thanks YOU a mil, Dragão!
DeleteJust tagged it.
AS I was looking for more volume, checking the schematic, I found some issues where I need your advice:
ReplyDeleteCorrect me if I'm wrong, please: I suspect there's a 10uF electrolite missing between OPA2134 pin 4 and ground (parallel with 100nF cap). Should'n't be a cut in G10?
Thanks in advance!
Hi there!
DeleteFor the suggested cut at G10. Pin 5 of IC3 generates the -9v power supply that needs to be connected to both pins 4 of the TL072 and OPA2134. A cut would cut the oout negative power supply from the OPA2134 so I'm afraid that isn't the culprit for the low output. Same with the missing 10uf cap. It is essentally another power filter cap at the negative power supply rail along with a 100uF and 100nF ceramic. It is a bit overkill but I'll try to squeeze it in.