When pulses stop coming in the input, the power consumption of the circuit jumps from 10 mA to 80 mA, is there anyway to lower the power consumption? It's going to kill batteries!
Thanks again, Rich
It would help to have a schematic of your circuit so that we may see the details. There may be something that can be done to influence the state the 555 enters when it is not being triggered.
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Yes there are, it's a missing pulse detector with a tlo82 amp that provides a zero to 12v inverted pulse to the shown circuit. The first stage of the tlo82 amp operates at a very high gain,and the second stage of tlo82 operates as an inverting buffer ( open loop gain). The second output of the tlo82 goes directly to pin two of the shown 7555 circuit.
I disconneted the 7555 circuit shown, and placed a 1 ohm resistor between it's ground and the power source ground--- scope reads 80mv. Could the PNP transistor base allow that much current? This is an soic/1206 circuit, so placing probes and jumpers is very difficult.
Are we talking about an actual circuit or are we talking about a simulation of a circuit?
If it is an actual circuit then try putting a 1K ohm resistor in series with the 7555's output pin (pin 3) and the base of the transistor. This should not adversely affect the circuit since the input impedance of the PNP base should be very high. Then measure the current draw and see what you get.