Has anyone ever built one of these - I had a ESR meter which has recently died and need to check a few caps for a monitor so thought I'd give this one a go.
https://www.qsl.net/iz7ath/web/02_brew/15_lab/06_esr/index.htm
I've build the ESR meter but can't seem to get it to work. If anyone has built one I'd appreciate a few pointers. I've attached a few scope screenshots.
On the circuit IC1A is generating a square wave. The collector is TR1 is shown here (**broken link removed**)
and the collector of TR2 is here (**broken link removed**)
If I short the cap out the LED should come on but it doesn't. The pins 5 and 6 of IC1 are both 0V
Any tips of where I could be going wrong. Such a simple circuit its driving me crazy!
https://www.qsl.net/iz7ath/web/02_brew/15_lab/06_esr/index.htm
I've build the ESR meter but can't seem to get it to work. If anyone has built one I'd appreciate a few pointers. I've attached a few scope screenshots.
On the circuit IC1A is generating a square wave. The collector is TR1 is shown here (**broken link removed**)
and the collector of TR2 is here (**broken link removed**)
If I short the cap out the LED should come on but it doesn't. The pins 5 and 6 of IC1 are both 0V
Any tips of where I could be going wrong. Such a simple circuit its driving me crazy!