Build Your Own Clone Message Board

Can't get the 27V Boost Kit to work. Everything seems to be attached right. The IC 7660S Is getting really hot like burn your finger hot. Could this be the problem, a bad IC? Sound comes through it when unengaged and the light comes on

https://lh3.googleusercontent.com/ofdibJ5pGxeWTLTwvFowEwuVWf4NgkOoeEmnuUqr6eqsEPtsZUOmhDAavwTbamKcsuP0vzqZRJyVeG5Dk4hI7FZJwoXgIuh66bj5qIUZjWpjjjjou9EF5mZi_mF3xqDPbtJXBhPGUQb9HqdD5cTtH_A0fGxF2qjiqK2iCfQxCjE5ayf3NGeArOWXROhwxHtKpoSrqej9RaD21FAtiUMUWAIclzzGGmGdlrgWRsCzlwvLhve_b3cYvbis_GVkZOJeZJcuhcYcxCsibSccWQH5aVOcHx9IQ4-poXgYgWO7bB-tlWwokYUc_wmd2oZ4eYWJzCN4I2jOtKsinQbSJt6-JJMWaAT1Z0oBDF0f4SpYLy-yFJZi3wnuK2vbS9106qMFH9v1gsTG7JWwpNMMjG3gELyutoi0N177JRjiwPair4b2Q1dQWFPrp-acA364_RSILlLiWv95w_FiKfJM8UTIkQ-lAHLfkWwqgimxLRcIwTPnerMzMqwUa1TmqvdOOQckIre9HkcuNAjO1VxBUbGMYup7VtDAE8YBMS4Z5EiCowiaZFmn1YSzxJhTvY3M1nNj3cQ1IuoZS4Xn6VPHrXUGiZEMpx7qE351v7u2KFTObWDl9McSAfaGt9MYSJU6qRfwOzWWajYifjwBEnPMiSgGVn4nYHZtV7mCF6F98_lYt0N0XKav39xXq3At0SrWsmFKfCNzNiTD76uS4nLEkTvl8A4k5iIwQKkdgNUqkchYLbapM4H9tygjTxU5iI8=w704-h938-no?authuser=0?.jpg

https://lh3.googleusercontent.com/5QuD1Jd4VwBztKsm_IcqInb5bMj3N189jKqjZgPK13UZfvLkKD4OeYlSUsnuW0klCFEeidPvbyqP2F5_19pHE0th0WUYz9wePdgrN_SJU8ccJLCTbWDhxKRwDPTx_TvbnSbEFR0pIjhLADpXtzv33mosHLd-QhACOrqgT_Fzkz7LrDGRmk3o2z4YeM4_27V1RK4l3Yr59_EEj1YASwn7DUJnQi8RIJMBE74Zz4v1RJa_o4HIH5phS_ovQlzNCwi_oAlFF9Xv9b7b9_Us8V1c9mgn2NiZ_n5aftivk_BFf_SxHCkjfKGsWu_Y0_je3os9G1KKRcxX2Z8nAnwovyAp9WUno6p5aOxnqZ-AkLMbuoxFGgabuqhhK_Ayfpi926p_0_XR8hjAVrBCRT0NKbfAAfEQWsjAloZhdROngBeoM6dBP3s9ngexipcMmCoOOpnZUqlT8FQT4HG_pMRiNW9qtG48uR0_-41aidMSu_7Wk8qBjvfYhLISAUs7lHaFiVs305yhxuwjIelh3_v0kh0qQc7mrB7tZiRdtrzgXwVFcsnQQvN7d1awn3JI9KNZ3Cl5XLgRIlnsSa57esq_M6O8waVspaizj80Sh2884Hft9aZM-CDsqV7MnmJsp5Xmao5elOw0hDa0Ih5qzx7bfn_6Zkzly8vCrjuwnv_RplRfddUjLKRTz75rnBDnFoQwiu0b3GOYtWioRWwtCzKttGgc2SM2bA5upUBHh-fgZQgGGLyl0V2peH6mszoZbE8=w704-h938-no?authuser=0?.jpg

https://lh3.googleusercontent.com/euADRpZP_braunAi8evx6jsrOWSUTeejhTMpuLdG5GPT0ROi2De_FkRA4c2t3Eu8SbMtjffzDqtQFiQVemkUPrL0rdEiLAGt1L0S-Ejd7a6i4wlkfKyepckJACPwr6ASbLRFRCDHDj9qrx0xzPykNb9bGp4ztsyXf8eA3EPmZu_GrayjJvDbbsvYrk3owpfIGW7XSq2VsiGQwLae6TjM1RuQekdb3TZSKj0vcmBzrKfCCDTT6lXB3lIyhnFFRCsaEsME7BPIWRj8OQZAi8DWvqd8SS0ZRbCtLyY765qJaly7WyRiVrpLqvxw0AILq4htfoGlbYTa08zVsh4eci_2RnZA9BiarKHf8ljpjZQZ1vvjlp_se5elQ5O7ozyKP4fjVj4_W9whClnNy3P52Nkh12cn652H-RIz3eVledwzdDj-EIqrfdFWklqLKBJ7_amyGUet0AvzpV7X-V0wbFVUKtnXXHz0USu_6I1GlCtmezQJEM3hageRvnxuhwaMDX0GUt393Ie9L5h7SSkPWjNTfiSaPi5UwGtuY5Knyb3zArrLB19rVTSbIuGg3nGMQTAiY1aFuMqQ7yy26LKuL4zpVN1BD3yGy3Z-FQcSVjWADjtqP0t_RA6cXN-ATTaky1I7LkTp6MyUXI8MKknqbNDTbVuM8Ty_mjcsW4jPScaW9koOQaRqfx9BrHV28snEnkSyxs9la6OsFX72U3_P8qi5fQ2bqQTABQzv2x_60dCO-Qi3Vdcex5Po5oNNnWw=w704-h938-no?authuser=0?.jpg

I can't see your pics. I converted your image tags to URL tags and that didn't fix it.

Your problem is most likely component placement, so we really need to see pics to help you.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

Any ideas? Should I replace the IC that is getting hot? Thanks

Probably. But we should try to figure out why this happened in the first place or your new IC might do the same thing. You should remove the 7660 and take voltage readings of the empty solder pads. And take voltage readings of the TL072 as well (but don't desolder that chip).

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

I used an audio probe and I get a signal all the way up to pin 3 of the first IC but I don't get a signal from Pin 1 on the other side. Does that mean the IC is bad.

Possible, but it's much more likely that IC1 isn't getting the required voltages from the 7660S, since that one is clearly overheating, often indicative of an internal short.

Keith suggested getting voltage readings from the solder pads for the 7660S after removing that chip, and also from the pins of IC1. Do you have a multimeter and know how to do this?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

I'm not sure how to do this. Can you give me a reference for this? Thanks

Sure! To measure the DC voltage level on the IC sockets or pins, set your multimeter to the DC voltage mode, indicated by a solid line above a dotted one. Use the 20VDC range setting if it's not an auto-ranging meter. Your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to each point that you want to measure. See left side of the image below for the numbering of the pins.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

So I have to remove the 7660S and then take readings from the all of the solder pads? Do I remove IC1 chip or just take readings with it installed? Thanks for the help> I have made a bunch of these and only a few have not worked. Usually from an upside down IC or a bad input or output jack. I glad this one is tough because I'm learning some more things. Also I am guessing I shouldn't have the pedal turned on while doing this. Thanks

Also what is the best way to remove ICs from the board when they are soldered in. Never had to deal with that before. Thanks

Correct.


You'll be replacing the 7660S, so just clip off the legs close to the body of the chip, remove & discard it, then desolder the legs individually and clean the residual solder out of the eyelets with a solder sucker and/or desoldering braid.


Leave it installed and take voltage readings from the pins.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Ok here are my readings

IC2 Removed
Pin 1- 9.64 Pin 2- 1.9 then goes down to 0
Pin 3- 0 Pin 4- 1.8 then goes down to 0
Pin 5- 6.41 Pin 6- 0
Pin 7- 0 Pin 8- 9.64

IC1
Pin 1- 7.88 Pin 2- 6.4
Pin 3- 5.9 Pin 4- 6.4
Pin 5- 0 Pin 6- 7.9
Pin 7- 7.98 Pin 8- 8.6

Pin 5 of the 7660 and pin 4 of the TL072 should be 0v. Since you are getting voltage there, I would assume that there is an internal short in the TL072.

Is the TL072 getting hot?

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

No it's not getting hot

If you're certain that you took those voltages correctly, then you'll need to remove the TL072 as well. Please take voltages of the empty TL072 solder pads.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

Ok. I should just by a new pedal at this point. LOL. I'm learning some things though. I'll probable do that tomorrow. and let you know. Thanks

I Did this by mistake taking out the chip



The other side looks like this. Am I okay

Readings from the removed IC1
Pin 1- 8.95
Pin 5- 2.17
Pin 6- 2.73
Pin 7- 1.11
Pin 8- 9.1

All the other pins would start at around 2.8 and go down to 0

bump

I'll leave the voltage interpretation to Keith, but you were very lucky how you damaged the op amp PCB eyelets. The three pads you ripped off the PCB weren't connected to anything. The only trace connection on the component side of the PCB is to pin 8 and it looks like that connection is still intact (and it's a pretty easy repair if it's not). The other 7 pins have their trace connections on the solder side of the PCB, and those all appear to be OK.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Thanks

I'm questioning the validity of your voltage readings. If pin 1 really is 8.95v then you have a pretty big short somewhere. But then pin 5 (which is only separated from pin 1 by a 10k resistor) is only 2.17v. And pin 6 voltage is higher than pin 5 which doesn't make sense since the voltage from pin 1 would be passing through what is essentially a voltage divide.

And are you implying that there is continuity between pins 2, 3, and 4? Or they all coincidentally have the exact same falling voltage?

Please take voltage readings of the empty 7660 again now that the TL072 has been removed, and we'll see if that makes more sense. Also, take a voltage reading of the primary voltage divide. This would be either of the eyelets on the right side of the two 10k resistors that are in the upper left hand corner of the PCB.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

Both ICs removed
7660S Readings
Pin1- 9.64
Pin2- 10 down to 0
Pin3- 0
Pin4- 10 down to 0
Pin5- 0
Pin6- 0
Pin7- 0
Pin8- 9.64

right side of the two 10k resistors- 4.79

Here is my Multimeter setting in case I have that wrong.