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  1. R

    UM66 is not giving full tone

    Hi Kelly, Bell push is before TR1 Transformer, it is not shown in the schematic. I used BT66 (Q1) melody generator which is similar to UM66 Output is speaker connection J1 at extreme right side of the schematic.
  2. R

    UM66 is not giving full tone

    Hi, I made a UM66(BT66) door bell circuit. it is operated from mains by main door bell switch. It has a LM386 amplifier circuit also. My problem is BT66 is not giving full tone on pressing the switch. I mean whenever the switch is pressed and released, the bell circuit should ring until the...
  3. R

    Can I use resistor instead of pot with LM386?

    Hi, I am using a LM386 amplifier to amplify um66 output. Speaker is 8 ohm 1 watt. Supply voltage in 9v I don't want to vary the sound level so, the pot is not needed here. Just I want maximum of sound. So, my question is , can I use 10k resistor instead of a 10k pot in the circuit given...
  4. R

    Audio level with potentiometer

    Hi, sorry for my foolish question, I am a newbie. I want to know at what resistance we get maximum audio level? I mean If we use 10K potentiometer in a amplifier circuit, will we get maximum audio level at 0 resistance or 10K resistance. thanks in advance.
  5. R

    amplifier circuit(2N3904) giving no sound

    Hi Everyone, I am a beginner hobbyist. I made a ding dong bell circuit, you can see it below but, sound at output was too low. I am using a 8 ohm speaker, may be 3 or 5 watt. so, I added a dual 2N3904 circuit for amplification of sound, you can see the circuit below: but there is...
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