[Elecraft] DVM Resistance and Continuity Tester

[DolfinDon@aol.com]

In a message dated 1/2/2002 6:24:40 PM Central Standard Time, 
sbralr@earthlink.net writes:



The discussion on DVM and measuring resistance reminded me of a neat circuit
I found to build a Continuity Tester.   I built this a while back this when
working with some Solid State Circuits and also used it building my K2 to
verify I had good connections on the Toroids.  Thanks to it I did not have
any PTTR, (Hi N0SS).  The following is the link to it.

http://www.uoguelph.ca/~antoon/circ/cntnuity.htm

I built it like the schematic, but rather then build the multi vibrator
circuit (T4 and T5), I cheated and used T3 to drive a Sonalert.  Nice part
about this tester is you do not need a On/Off switch.


=============================================


Hay that reminds me. I have about 1000 PC board mount sonalerts Mallory part 
number MSR320. I used them on a circuit board I make but I have changed to 
another type (louder). This piezo buzzer is about the size of a quarter and 
about .5 in high and will operate on 3 to 20 volts DC. About 70 dB at 3200 
Hz.

If you have a use for some of these I will sell them for 10 for $5.00 plus 
$3.20 for priority postage. Minimum 10 no maximum up to what I have on hand

email me if you are interested.

Don Brown
KD5NDB


K2 #1808,#2174,#2153
K1 #1000,#542