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ssm2164_getting_started [2018/04/26 17:05]
phatline [Class AB]
ssm2164_getting_started [2018/04/26 19:28]
phatline
Line 2: Line 2:
 seppomans building information;​[[ssm2164_pcb]]\\ seppomans building information;​[[ssm2164_pcb]]\\
 the following informations are take from the midibox forum, its a collection of infos, without the claim to be 100% true, i will try to test the given information. the following informations are take from the midibox forum, its a collection of infos, without the claim to be 100% true, i will try to test the given information.
 +
 +====== Shematic ======
 +not found anywhere... m( \\
 +also reverse engeniering/​understanding/​troubleshooting/​moding is nearly impossible when the pcbs are stuffed, because most of the traces are on the component site... or hidden behind the black paint\\\
 +--- first i want to know for what are those POTs? Input Gain of Audio? or of CV? or some BIAS? seppoman said nothing...\\
 +POT P1 middle & right Pin connected to VCC-\\
 +POT P1 left Pin connected to a 27K Resistor and this resistor to a nother 27K Resistor which is connected to CV1+ Input. the middle point of this2xresistors is going to the TL74-OP-Amp Pin1 which is a inverting input...\\
 +The Output of this TL74 Stage is Pin1: its connected to Pin 6 SSM2164, which is the CV-Input\\
 +When i measure Pin6 to Ground, and Turn P1 most left:​1,​8V... Turn P1 most right: 2,47V\\
 +so what does it? no one said: its a zero offset for bipolar cv? or is it gain-control?​ FIXME m( \\
 + 
  
 ====== Power ====== ====== Power ======
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 Pin 1 is Open, no Resistor to +12V (PCB Default)\\ Pin 1 is Open, no Resistor to +12V (PCB Default)\\
 Lower  current results in higher distortion/​lower noise.\\ Lower  current results in higher distortion/​lower noise.\\
 +---i do want distortion and dont care about noise--- so i do not change anything, the pcb is fine.
 ==== Class A ==== ==== Class A ====
 Pin 1 is Connected to +12V via a Resistor\\ Pin 1 is Connected to +12V via a Resistor\\
ssm2164_getting_started.txt ยท Last modified: 2018/04/26 19:28 by phatline