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Darren - i am still buying electronic supplies from China, and
turnaround is a few weeks. If the value is low, then GST is not an
issue - so far anyway.
Neil Jepsen. B.Sc. M.Sc(Hons).CPL.MASNZ.
Jepsen Acoustics & Electronics Ltd
22 Domain Street
Ph +64 6 3577539 Mob 0274428094
Web site: www.noiseandweather.co.nz
On 6/01/2021 11:55 am, Tony Nixon
I am really surprised that the delivery time from
China to NZ is so long. I have been buying Arduino and other
small electronic parts from China using ebay for the last 5
years, generally keeping orders below GBP10 to avoid attracting
duty. Delivery has usually been 2-3 weeks (and free too!) Most
of the same parts can also be purchased from UK suppliers on a
weeks turn round but at about double the price. Are there no
similar suppliers in NZ?
I have noticed in the last two months though that
free delivery seems to be disappearing, I read somewhere that
some concessionary deals offerd to the Chinese for cheap
shipment have now ended. A more worrying development that I
have just started to hear about is that post Brenxit the UK is
apparently going to require all suppliers selling into the UK to
register to pay VAT with the UK authorities. One European
supplier (of bike parts) has apparently already decided no
longer to deal with customers in the UK.
I am just beginning to experiment with an ESP8266
Node MCU to get a time stamp from NTP to log temperature,
pressure and error on my Pulsynetic.
On 5 Jan 2021, at 19:48, Darren Conway
Here is a Aduino
Motor shield that would be ideal for driving the Gents
and Solari slave clocks.
36 Orr Crescent
ph +64 (0)4 569 1963
On 6.01.21 7:12 am, Darren Conway
If I only had
to drive slaves from the Synchronome, an opto isolator
would be the obvious choice. I already have one.
An Aduino with ready made shield is probably the easiest way
to convert a 30 second pulse to a one minute bipolar drive
for the flip clock. Easier than building from discrete
components. If I do that, then using the Aduino as an
electronic relay to drive the slave clocks would make sense.
thinking of using a cheap Chinese motor/power
switch shield with an Aduino to generate the
bipolar drive for the flip clock. Generating a
bipolar signal requires and H driver circuit, as
used to drive stepper motors or DC motors. If I
get a Auduino wifi version, there is the potential
to use an on-line NTP server as the master clock,
complete with automatic daylight time
corrections. The only problem is that shipping
times from China are currently about 3 to 6
master still needs to drive its own solenoid coil
and case fitted slave, so a snubber circuit would
still serve a purpose.
On 5.01.21 10:54 pm, John Haine
because it's opto isolated, it needs a current of ~3 mA
into the input pin to light up the internal LED, so you
drive it through a suitable resistor to get that current
from whatever voltage is across the contacts. In this
case with 12 V that would be 12/3 = 4 K ohms, or 3.9 K