Circuits & Schematics Texas Instruments

1. Single sideband radio meets LMC555 beat frequency oscillator
   Stephen Woodward
   Circuits Oscillators Radio Texas Instruments LMC555
   This basic beat oscillator makes continuous wave keyed code and single sideband suppressed carrier signals audible. A recent Design Idea from contributor Gavin Watkins shows an inexpensive add-on beat frequency oscillator (BFO) [ 1 ] for ...
   Aug 25, 2026
2. Add-on beat frequency oscillator (BFO) for shortwave radio
   Gavin Watkins
   Circuits Oscillators Radio Antique Texas Instruments LP2950
   Expensive shortwave radios include beat frequency oscillators, so why not also add one to an inexpensive radio version? Broadcast shortwave (SW) radio use may be declining, but there are still lots of interesting signals to listen to between 1.6 ...
   Aug 25, 2026

3. Cheap and cheerful LMC555 RC PWM pulse generator
   Stephen Woodward
   Circuits Oscillators Measurement Texas Instruments LMC555
   This circuit enables you to generate remote control PWM test signals with a (very) generic (and cheap) chip. A recent Design Idea ( Ref. 1 ) illustrated the application of an interesting chip (the LTC6992 ) to remote control (RC) PWM test signal ...
   Aug 13, 2026
4. Phantom-powered solid-state linear airflow sensor
   Stephen Woodward
   Circuits Measurement Texas Instruments TLV2197 LM7905
   Self-heated Darlingtion transistor pair linearly senses airflow using just two wires for both power in and signal out. Suppose we take a common TO-92 transistor and heat it to a constant temperature differential above ambient. The power input ...
   Aug 11, 2026
5. Hz to 4-20mA or 0-20mA current source is compatible with grounded loads
   Stephen Woodward
   Circuits Analogue Design Interfaces Texas Instruments LM2917
   Minimal circuit converts input frequency to a precision current source that also accommodates grounded inputs. I recently had the opportunity to share a design ( Ref. 1 ) for frequency to current loop conversion using the versatile (if somewhat ...
   Aug 10, 2026
6. An off-line power supply
   Gavin Watkins
   Circuits Supply Texas Instruments LM317
   One of my electronics interests is building radios, particularly those featured in older UK electronics magazines such as Practical Wireless, Everyday Electronics, Radio Constructor, and The Maplin Magazine. Most of those radios are designed to run ...
   Jul 29, 2026
7. Build a practical 400 mA linear Li-ion charger with visible CC-CV behavior
   Richard O. Ocaya
   Circuits Supply Texas Instruments LM324 LM431
   Single-cell lithium-ion (Li-ion) chargers are widely used, yet many practical designs rely on highly integrated ICs that conceal their internal operation. The type of Li-ion charger outlined in this design is, somewhat surprisingly, not readily ...
   Jul 27, 2026
8. Current converter performs purely on paltry phantom power
   Stephen Woodward
   Circuits Measurement Supply Texas Instruments OPA2244
   Convert a 4-20 mA signal to 0-20 mA and deliver it to a grounded load with no additional power supply needed. Recently, EDN kindly published a design of mine for a micropower 4-20 to 0-20 mA current loop converter ( Ref. 1 ). Shortly thereafter, in ...
   Jul 23, 2026
9. Eight solar cell lithium-ion battery charger
   David A. Johnson
   Circuits Supply Solar Texas Instruments TLV2401 LMC7111
   Version 1 A single lithium ion battery cell needs 4.2 V from a current source to insure it is fully charged. A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more ...
   Jul 16, 2026
10. Painlessly convert Hz to 4-20mA current loop
    Stephen Woodward
    Circuits Supply Texas Instruments LM2917-N
    The iconic LM2917 tackles frequency-to-current conversion with (very) few externals. Almost exactly 50 years ago in June 1976, to be precise National Semiconductor introduced the LM29x7 series, offering deceptively simple monolithic solutions to a ...
    Jul 16, 2026

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