Hello: proportional controllers from the Old Country are also available
for around $15 on ebay. The one i have uses type K thermocouple.
Don
On 2019-10-12 18:13, Perry Sandeen via time-nuts wrote:
Yo Bubba Dudes!,
The suggestion was made to use a ebay item number 192112054053 heater
for this
I created a temperature test setup for my TCXOs. Relay control did not last
long because the relay was operating once a second or so and the Peltier
uses a lot of current. The relay contacts welded in a few hours. Luckily I
was watching when it happened. A PID controller running H bridges works a
Yo Bubba Dudes!,
The suggestion was made to use a ebay item number 192112054053 heater for this
project.
Now it's cheap and has a digital reading.
BUT
It is a bang- bang controller using a relay. At some point that relay will
stop working. Also all designs I've seen for good temperature
