thirty five LM358 connect in parallel

Replies

• 

  gemini061978

  chuackl

  Any have try before use an LM358 as a voltage follower/unity gain opamp to drive a 10ohm load? it is not working right? However, it seem that it will works if connected thirty five LM358 in parallel driving the 10ohm load, the output voltage can be adjust from the range of 0 to 10v. Any have done this experiment before kindly leave a comment or feedback because it is working but i have no idea will such connection spoil the IC or not.

  ur experiment is eqvivalent to driving 1 LM358 with 350 Ohm load .. hence it should not be problem ...
• 

  chuackl

  i also found that this circuit is almost equivalent to a power opamp which can have an output of high current. However,the lm675 only can have a minimum output of 5v and usually depend on the load connected. On the other hand, all 35 the lm358 connected in parallel can have a minimum output of 70mv when use as a unity gain buffer compare to lm675T. Furthermore, when connected in parallel it can have a more stable output to lm675 when driving heavy load. Oh ya, i also forget to mention how i connected those opamp in parallel. You can try it by connecting all the inverting input to the output of the opamp and all the output connected to a load. the non-inerting input all connected to a potentiometer so that all will read the same voltage value. After that, try adjust the potentiometer and observe the maximum output when connected to a 10ohm load. Repeat the step by connecting more lm358 opamp in parallel
• 

  chuackl

  yeah what gemini reply are true also the more opamp connected in parallel the bigger the resistance as seen by the opamp😛