No I am yet to try another chip. I only finished wiring this prototype about an hour ago. I'll add a pic although I don't think it will help much.hi N1
Do you mean the gate inputs are open circuit, not connected , when you see a high on the output.?
E
hi N1
Do you mean the gate inputs are open circuit, not connected , when you see a high on the output.?
E
Does that mean that pins 1 and 2 are directly connected to GND on pin-7?Hi Eric,
The gate inputs (pins 1 and 2) are at zero volts, yet the gate output (pin 3) at 12V.
No. 1 and 2 are connected to their respective gate inputs. The gate inputs are the outputs of 2 interal relays within radar sensor devices.Does that mean that pins 1 and 2 are directly connected to GND on pin-7?
Good idea. Thanks. Will test. Essentially I want each radar sensor output (12V) to be triggered simultaneously in order for the gate output to trigger an alert. I note the input at pin 14 is 12.45V and pin 3 is at 11.64V. The gate outputs for the other 3 gates is at zero V.As a temporary test, try putting jumpers from pins 1 and 2 to GND.
Ok. Holding pins 1 and 2 to ground arrests the output of pin 3.Good idea. Thanks. Will test. Essentially I want each radar sensor output (12V) to be triggered simultaneously in order for the gate output to trigger an alert. I note the input at pin 14 is 12.45V and pin 3 is at 11.64V. The gate outputs for the other 3 gates is at zero V.
Hi Eric,hi N.
Is the 0V pin #7 of the 4081, connected to the 0v of the Radar unit.?
E
If those relays provide an open circuit (floating) for the "zero" signal, then you need to add a resistor (e.g. 10kΩ) from each gate input to ground to establish a 0V zero state voltage.The gate inputs are the outputs of 2 interal relays within radar sensor devices.
Thanks for the reply. If the gate inputs are tied to ground when the relay switches and the output goes high wont that track to ground instead of going through the gate?If those relays provide an open circuit (floating) for the "zero" signal, then you need to add a resistor (e.g. 10kΩ) from each gate input to ground to establish a 0V zero state voltage.
And you cannot reliably measure the voltage of an open-circuit with a voltmeter, since the input impedance of the voltmeter pulls the floating voltage to ground.