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temol
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Feb 7, 2019
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Today at 5:03 PM
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temol
replied to the thread
A simple Relay Bypass
.
Prototype.
Today at 7:30 AM
temol
replied to the thread
A simple Relay Bypass
.
One more thing. It may be tempting to make the circuit in SMD, but you have to remember that R4 is a workhorse here, it can get warm. I...
Yesterday at 9:09 AM
temol
replied to the thread
A simple Relay Bypass
.
It is worth remembering that the relay contacts in the schematic are in the ON position.
Yesterday at 7:10 AM
temol
replied to the thread
A simple Relay Bypass
.
I'm testing this circuit on a breadboard now. With 9V supply and NA5W-K it draws around 3mA when Off and 30mA On (including 3mA for the...
Sunday at 5:27 AM
temol
replied to the thread
CLR for 10mm LED (superbright waterclear)
.
This is why there should always be a resistor in series with the trimmer. e.g. 470R or 1k.
Friday at 8:27 AM
temol
replied to the thread
This week on the Breadboard - FET / Germanium Boost
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That was the intention :)
Mar 17, 2023
temol
replied to the thread
This week on the Breadboard - FET / Germanium Boost
.
My version of the boost. Q1 - MMBF5457, Q2 - MP38A. Enclosure waiting for painting.
Mar 17, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
Here's simplest breadboard setup for Vp measurement. You can add a switch to disconnect the battery. Mind the pinout!
Mar 15, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
I've checked my layout ten times before postign it here.. Do you have a breadboard? Same circuit, different layout.
Mar 15, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
It looks like wiring errors and a transistor not plugged in properly. Here's the pinout for 2N5457. And here's correct wiring.
Mar 15, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
Your DMM is fine for BJT transistors, not JFETs. You can still use it but not the hFE measurement mode...
Mar 14, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
Three possible reasons come to mind why you can't set the drain voltage lower. 1. Trimmer value different than it should be (for example...
Mar 14, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
Check this one also. It's a LED current limiting resistor. 4k7 according to the build doc, but looks like you have silver stripe there.
Mar 14, 2023
temol
replied to the thread
Mofeta FLAMING HOT TRANSISTOR 😬
.
Check the value of R10 - should be 3k3 (orange, orange, black, brown, brown). Looks like you have installed 3R3 instead of 3k3.
Mar 14, 2023
temol
replied to the thread
First Time Building, want to build Dunwich DA-120
.
47uF - this is an electrolytic capacitor (polaryzed). Capacitors are labeled with pF, nF, uF. Install DIY Layout Creator and look...
Mar 13, 2023
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