Neil Groves
New Member
i Just built this circuit:
https://www.electro-tech-online.com/custompdfs/2012/01/2126272.pdf
well i have built it as far as the bass channel goes and thought i'd test it before i go any further, what i was expecting feeding the circuit with a sinewave was the bass channel L.E.D to start to glow at around 50Hz be fully bright at about 100Hz and then fade as i increased the frequency towards 200Hz, what i am getting in fact is the L.E.D starts to glow at 20Hz, is fully bright by 150Hz but then stays fully bright never dimming again as i increase the frequency well up to 6Khz and beyond, either i have an error in the way i have connected it on the breadboard, or there is an error in the schematic?
what am i supposed to see on Pin 7 of IC1b? i was expecting a dc level but i don't get that till after the diode, then it gets to 0.7v and stays there which i understand means the transistor has fully saturated?
can anyone give an insight to this circuit please?
Neil.
https://www.electro-tech-online.com/custompdfs/2012/01/2126272.pdf
well i have built it as far as the bass channel goes and thought i'd test it before i go any further, what i was expecting feeding the circuit with a sinewave was the bass channel L.E.D to start to glow at around 50Hz be fully bright at about 100Hz and then fade as i increased the frequency towards 200Hz, what i am getting in fact is the L.E.D starts to glow at 20Hz, is fully bright by 150Hz but then stays fully bright never dimming again as i increase the frequency well up to 6Khz and beyond, either i have an error in the way i have connected it on the breadboard, or there is an error in the schematic?
what am i supposed to see on Pin 7 of IC1b? i was expecting a dc level but i don't get that till after the diode, then it gets to 0.7v and stays there which i understand means the transistor has fully saturated?
can anyone give an insight to this circuit please?
Neil.