Is there any way to test 3207 and 3102 BBD chips?
- Rambozo96
- Breadboard Brother
- deltafred
- Opamp Operator
I recently had 2 (identical) choruses in to repair (Identical schematic to the Behringer UC100), one had bad noise on the chorus signal, the other only had clean output.
I downloaded the datasheet for the 3207 and 3102 and found that on the second one there was no output from the 3102 (pins 7 & so I robbed the chip out of the noisy one and got one working.
The first one was noisy even without the 3102. I tacked this down to a surface mount transistor, it was either a bad joint or a noisy transistor. I swapped it and that cleared the noise. I then ordered a 3207 and 3102 pair from China (dirt cheap), replacing the 3102 restored the chorus signal.
Total cost 0.99 GBP and one transistor pulled from a random scrap board.
I downloaded the datasheet for the 3207 and 3102 and found that on the second one there was no output from the 3102 (pins 7 & so I robbed the chip out of the noisy one and got one working.
The first one was noisy even without the 3102. I tacked this down to a surface mount transistor, it was either a bad joint or a noisy transistor. I swapped it and that cleared the noise. I then ordered a 3207 and 3102 pair from China (dirt cheap), replacing the 3102 restored the chorus signal.
Total cost 0.99 GBP and one transistor pulled from a random scrap board.
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
- deltafred
- Opamp Operator
That should read pins 7 & 8. 8 followed by a closing round bracket must be the code for a smilie!deltafred wrote:(pins 7 &
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
- Dirk_Hendrik
- Old Solderhand
Information
So did I years ago! They looked fine I thought.... but got very hot once powered. I learned a lot about Chinese fakes since that time. And, over the years I more and more get amazed that the attitude of absolutely not caring about selling fake stuff, reworked stuff and all other forms of fraud is so common in China.deltafred wrote:I. I then ordered a 3207 and 3102 pair from China (dirt cheap),
- deltafred
- Opamp Operator
I got mine in August 2018, I only used the 3102 and it worked fine so guess I was lucky.Dirk_Hendrik wrote:So did I years ago! They looked fine I thought.... but got very hot once powered. I learned a lot about Chinese fakes since that time. And, over the years I more and more get amazed that the attitude of absolutely not caring about selling fake stuff, reworked stuff and all other forms of fraud is so common in China.
I did think at the time that I might be wasting 0.99GBP but figured it was worth the risk!
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012