hi,
Your ref link says the 1K is required, if the cap is charged and the main power rail disconnected its possible that the cap could discharge thru ref pin.!
hi,
Your ref link says the 1K is required, if the cap is charged and the main power rail disconnected its possible that the cap could discharge thru ref pin.!
This has worked for me. **broken link removed**
Should work on a 16VDC supply with a different relay. Play with R2 and C1 for the specific time delay you need. A non-logic level MOSFET might give you a longer delay.
haha.. yeah coz I wondered since BJTs are extremely sensitive to changes to the base current.. so I thought that MOSFETs might be so too in the case for it's gate voltage... so when the capacitance changes and so on.. well you know..
So, can the delay circuit be powered off of one side of the supply...+16v to ground? And, does the delay to the relay occur when the +/-16V supply is turned on? Or, is the +/-16v supply always on and there is a switch between it and the delay circuit?
Hi. Thanks. No switch. Its more that I'd like a delay to let the powersupply up before putting my load on. Ideally I'd like it across +16 and -16 rather than one side and 0V but if this can't be done then sure. Is it possible to use it over +-16V do u think?
Thanks again
The simplest way to delay the operate of a relay is to connect a capacitor across the coil and a resistor in series.
So in your case, you could use a 12 Volt relay in series with a resistor equal to that of the coil resistance with a capacitor across the coil of such a value as to provide the delay you need.
The simplest way to delay the operate of a relay is to connect a capacitor across the coil and a resistor in series.
So in your case, you could use a 12 Volt relay in series with a resistor equal to that of the coil resistance with a capacitor across the coil of such a value as to provide the delay you need.