ocr: +9-12V D1 2V2 R7. R3 C1 1K R5 10K, 1K 10uF tant 1 - Input U1A voltage - - - - - - 3 4 - - - 21 R4 fbrt R6 12 U1B 10K 10R R1 R2 Output current 10K 1K For better performance use Darlingtons for U1 = LM324 Q1 - and Q2, OP-07 devices for U1A and Q1 Q2 = = BC548C BC558C or or similar similar and U1B 1% (a negative resistors for supply R2, will R3, be and required), R5. VOLTAGE TO CURRENT CONVERTER
