Projects, Designs, and Technical Stuff

Projects, Designs, and Technical Stuff

Show off your projects you are working on. Talk about designs or ideas, ask technical questions, and share technical information.

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LT3081 LTspice problem?

Started by ADA_78 on 30 Jan, 2026 20:14
Last post by ADA_78 on 02 Feb, 2026 17:22

Views: 3146, Replies: 21
Regarding BFR 80 pnp transistor pinout datasheet

Started by tedsorvino on 01 Feb, 2026 12:32
Last post by tedsorvino on 02 Feb, 2026 13:27

Views: 887, Replies: 8
wtf is with these caps?

Started by coppercone2 on 21 Jan, 2026 03:19
Last post by bdunham7 on 02 Feb, 2026 00:39

Views: 8731, Replies: 83
Connector for removable battery pack

Started by Zipdox on 30 Jan, 2026 13:05
Last post by Zipdox on 01 Feb, 2026 23:17

Views: 327, Replies: 1
shocking gum prank toy circuit

Started by eTimesV on 27 Jan, 2026 18:10
Last post by floobydust on 01 Feb, 2026 19:51

Views: 3614, Replies: 9
How to build a power switching module

Started by moffy on 01 Feb, 2026 03:38
Last post by temperance on 01 Feb, 2026 19:18

Views: 417, Replies: 1
Powering tiny cold cathode discharge lamps

Started by ChristofferB on 31 Jan, 2026 23:29
Last post by LaserSteve on 01 Feb, 2026 17:33

Views: 489, Replies: 3
Long shot but modern LED, channel mount, strip lighting for commercial?

Started by viper on 31 Jan, 2026 23:18
Last post by jonpaul on 01 Feb, 2026 12:01

Views: 407, Replies: 1
I made crude ternary DAC, now with 125% more states

Started by dusan on 31 Jan, 2026 07:35
Last post by PCB.Wiz on 01 Feb, 2026 08:44

Views: 717, Replies: 4
ChatGTP 5.2 + kiCad not working.

Started by PeterG on 29 Jan, 2026 23:55
Last post by shapirus on 01 Feb, 2026 08:44

Views: 3566, Replies: 20
Upgrading switchboards

Started by calzap on 31 Jan, 2026 19:35
Last post by coppercone2 on 01 Feb, 2026 01:57

Views: 533, Replies: 3
QSPICE and Wine 10 on linux

Started by francoisphil on 29 Dec, 2025 00:46
Last post by 2nOrderEDO on 31 Jan, 2026 23:21

Views: 1171, Replies: 4
Display choice - Help - Suggestions

Started by milo123milo on 29 Jan, 2026 16:52
Last post by Benta on 31 Jan, 2026 22:26

Views: 600, Replies: 3
Derisk use of MLCCs for a robust PCB strategy.

Started by viper on 29 Jan, 2026 20:18
Last post by free_electron on 31 Jan, 2026 18:39

Views: 1455, Replies: 13
Why this basic LM386 audio amplifier circuit is not working?

Started by MegaFocus on 31 Jan, 2026 11:12
Last post by MariuszD on 31 Jan, 2026 13:35

Views: 513, Replies: 2
How do you make phase matching circuits without microcontrollers ?

Started by MathWizard on 31 Jan, 2026 00:57
Last post by PCB.Wiz on 31 Jan, 2026 07:21

Views: 586, Replies: 4
Cheap Chinese Boost Converters?

Started by sourcecharge on 24 May, 2020 22:08
Last post by AmeliaBuns on 31 Jan, 2026 05:43

Views: 6389, Replies: 9
Can anyone ID this power connector

Started by dorkshoei on 01 Oct, 2018 19:32
Last post by technotalk on 31 Jan, 2026 00:52

Views: 4609, Replies: 10
431/432 reference IC pinouts

Started by PwrElectronics on 30 Jan, 2026 16:47
Last post by floobydust on 30 Jan, 2026 23:19

Views: 492, Replies: 4
Another Deutsch Connector Question

Started by MarginallyStable on 29 Jan, 2026 21:02
Last post by MarginallyStable on 30 Jan, 2026 22:14

Views: 442, Replies: 2
Help! Is my small signal analysis wrong for Wilson Current Mirror?

Started by isitayush on 27 Jan, 2026 13:14
Last post by isitayush on 30 Jan, 2026 18:52

Views: 789, Replies: 2
Find primary mutual inductance given secondaries with different coupling

Started by 741 on 28 Jan, 2026 18:29
Last post by mtwieg on 30 Jan, 2026 13:30

Views: 1256, Replies: 3
Troubleshooting Noise and Slow Playback on ESP32 +PCM5102A + TPA3116 Audio Setup

Started by hsynylcn on 30 Jan, 2026 12:02
Last post by Zipdox on 30 Jan, 2026 13:18

Views: 2544, Replies: 2
What do you guys think of this PCB? (first time doing 4 layers)

Started by AmeliaBuns on 30 Jan, 2026 07:14

Views: 299, Replies: 0
Sourcing PTC thermistors for Sencore PA81

Started by markf31 on 25 May, 2025 00:20
Last post by Gammax on 30 Jan, 2026 06:00

Views: 706, Replies: 2
Soft power button works, but button signal stuck low after power-on?

Started by ricko_uk on 30 Jan, 2026 00:43
Last post by ricko_uk on 30 Jan, 2026 02:02

Views: 1105, Replies: 4
Tube based car telephone 1961

Started by oz2cpu on 29 Jan, 2026 23:13

Views: 312, Replies: 0
Power Board Creation

Started by TechyTanya on 29 Jan, 2026 13:57
Last post by PGPG on 29 Jan, 2026 14:41

Views: 481, Replies: 1
Constant Current Power Supply

Started by cabala on 28 Jan, 2026 19:36
Last post by mtwieg on 29 Jan, 2026 14:02

Views: 860, Replies: 5
Symmetrical PSU from 18650 batteries question for portable Op Amp

Started by Overspeed on 29 Jan, 2026 10:50
Last post by Overspeed on 29 Jan, 2026 11:54

Views: 473, Replies: 2
ZIF connectors versus headers

Started by Simon on 29 Jan, 2026 10:17

Views: 310, Replies: 0
Neutral point oscillations in a 4-leg inverter under unbalanced loads using PI c

Started by VadimDCL on 25 Jan, 2026 13:28
Last post by moffy on 29 Jan, 2026 08:24

Views: 1063, Replies: 7
Anyone have a good comparison of MOSFET, IGBT, and SCR?

Started by viper on 24 Jan, 2026 18:24
Last post by coppercone2 on 28 Jan, 2026 23:35

Views: 5765, Replies: 34
Project Review Request: ESP32-based Stove Controller

Started by themars on 26 Jan, 2026 14:37
Last post by thm_w on 28 Jan, 2026 22:39

Views: 985, Replies: 7
Modbus TCP on Omron CP1L-EM PLC - no traffic?

Started by Kremmen on 28 Jan, 2026 14:02

Views: 526, Replies: 0
Turning on and off a SMPS with DC control

Started by Ultron81 on 27 Jan, 2026 16:58
Last post by Psi on 28 Jan, 2026 05:03

Views: 786, Replies: 7
Why do ceramic SMT MLCC caps often fail short?

Started by bson on 21 Jan, 2026 23:01
Last post by iMo on 27 Jan, 2026 20:12

Views: 4519, Replies: 26
Do you have any experience with some hermetic feedthrough for USB 2.0

Started by Miyuki on 21 Jan, 2026 18:16
Last post by LaserSteve on 27 Jan, 2026 17:33

Views: 1006, Replies: 6
strategy to bias several amplifiers at once

Started by john23 on 23 Dec, 2025 12:23
Last post by DavidAlfa on 27 Jan, 2026 14:52

Views: 834, Replies: 3
RS-485 bus modeling (and some measurements)

Started by eleguy on 26 Oct, 2025 15:05
Last post by PGPG on 27 Jan, 2026 14:14

Views: 2906, Replies: 19

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Projects, Designs, and Technical Stuff

Projects, Designs, and Technical Stuff

LT3081 LTspice problem?

Regarding BFR 80 pnp transistor pinout datasheet

wtf is with these caps?

Connector for removable battery pack

shocking gum prank toy circuit

How to build a power switching module

Powering tiny cold cathode discharge lamps

Long shot but modern LED, channel mount, strip lighting for commercial?

I made crude ternary DAC, now with 125% more states

ChatGTP 5.2 + kiCad not working.

Upgrading switchboards

QSPICE and Wine 10 on linux

Display choice - Help - Suggestions

Derisk use of MLCCs for a robust PCB strategy.

Why this basic LM386 audio amplifier circuit is not working?

How do you make phase matching circuits without microcontrollers ?

Cheap Chinese Boost Converters?

Can anyone ID this power connector

431/432 reference IC pinouts

Another Deutsch Connector Question

Help! Is my small signal analysis wrong for Wilson Current Mirror?

Find primary mutual inductance given secondaries with different coupling

Troubleshooting Noise and Slow Playback on ESP32 +PCM5102A + TPA3116 Audio Setup

What do you guys think of this PCB? (first time doing 4 layers)

Sourcing PTC thermistors for Sencore PA81

Soft power button works, but button signal stuck low after power-on?

Tube based car telephone 1961

Power Board Creation

Constant Current Power Supply

Symmetrical PSU from 18650 batteries question for portable Op Amp

ZIF connectors versus headers

Neutral point oscillations in a 4-leg inverter under unbalanced loads using PI c

Anyone have a good comparison of MOSFET, IGBT, and SCR?

Project Review Request: ESP32-based Stove Controller

Modbus TCP on Omron CP1L-EM PLC - no traffic?

Turning on and off a SMPS with DC control

Why do ceramic SMT MLCC caps often fail short?

Do you have any experience with some hermetic feedthrough for USB 2.0

strategy to bias several amplifiers at once

RS-485 bus modeling (and some measurements)

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