Comments on: DoorBell circuit using UM 66 IC

By: saikat

saikat — Thu, 15 Dec 2011 16:47:07 +0000

I get good help

By: ranjith

ranjith — Fri, 04 Nov 2011 12:17:14 +0000

thank u so much for u r valuble information
-ranji@pnr-

By: zaid

zaid — Mon, 24 Oct 2011 11:25:46 +0000

hey
i want its complete description
an any one help me ?????

By: seetharaman

seetharaman — Tue, 12 Jul 2011 16:52:51 +0000

Hi Kiran see the notes kindly delete R2 and connect speaker to + direct, without pot.

By: ramya

ramya — Tue, 12 Jul 2011 11:25:50 +0000

hello!
i saw the circuit it was good but i want to make reverse horn of car.please send me a simple and with loud sound because i am just a beginner of electronic.

thankyou,
from ramya

By: kiran

kiran — Tue, 12 Jul 2011 11:19:14 +0000

hi!!!!
i made the circuit but from the 100k pot fire sparks are coming out.please can you tell me whats wrong in the circuit.

thankyou,
from kiran

By: keshav bargaje

keshav bargaje — Thu, 07 Apr 2011 05:39:20 +0000

i want description about music bell circuit diagram can you send the same on my email id

By: Nirmal vyas

Nirmal vyas — Sun, 19 Sep 2010 03:42:19 +0000

Respected,
i want 36 v input operated, 2-3 minit timer musical pcb digram want with parts list. can u send me on my mail id
nirmal2006us@yahoo.co.in

By: seetharaman

seetharaman — Mon, 13 Sep 2010 17:46:14 +0000

Hi Maina try for 3481 series ICs HT3820, 4822, AM993-9A etc. any melody generator IC which can work from 2.7 to 5 volt can be used

By: maina

maina — Mon, 13 Sep 2010 11:06:37 +0000

i cant find um66 in kenya,what equivalent ic would u recomend 4 me